Taylor Swift has hinted at a rift with Justin Bieber, after she was filmed sticking her tongue out at him at the Billboard Music Awards.

Her pal Selena Gomez kissed ex Bieber backstage and Swift was having none of it.

Earlier in the night, Gomez and Swift sat together in the front row and watched while Bieber got booed accepting the Milestone Award.

"You do not want to open that can of worms," Swift reportedly said when asked what she and Selena were gossiping about at the time he picked up his award.

WATCH the video above to hear more and re-live that tongue moment below.

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  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Selena Gomez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Selena Gomez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Selena Gomez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Recording artist Kelly Rowland arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Kelly Rowland arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Kelly Rowland arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Ke$ha arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Ke$ha arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Ke$ha arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Ke$ha arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Ke$ha arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Recording artist's Chad Kroeger and Avril Lavigne arrive at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Recording artist's Chad Kroeger and Avril Lavigne arrive at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Jennifer Lopez and Casper Smart arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Jennifer Lopez and Casper Smart arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Jennifer Lopez arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Taylor Swift arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Taylor Swift arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress/singer Taylor Swift arrives at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Taylor Swift arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Taylor Swift arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Taylor Swift arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Nicki Minaj arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Nicki Minaj arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Nicki Minaj arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Nicki Minaj arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Safaree Samuels (L) and rapper Nicki Minaj arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Madonna poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Madonna poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Madonna poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Madonna poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Chris Brown arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Chris Brown arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Chris Brown arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Celine Dion poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Celine Dion poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Celine Dion poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images)

  • 2013 Billboard Music Awards - Press Room

    LAS VEGAS, NV - MAY 19: Recording artist Carly Rae Jepsen poses in the press room at the 2013 Billboard Music Awards at MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Singer Carly Rae Jepsen arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress Alyssa Milano (L) and David Bugliari arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Actress Alyssa Milano (L) and David Bugliari arrive at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

  • 2013 Billboard Music Awards - Arrivals

    LAS VEGAS, NV - MAY 19: Z-LaLa arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

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