The 'X Factor' judge did her very best Angelina Jolie-style leg bomb in a stunning, white floor length Julien MacDonald gown.
The former Spice Girl arrived at the bash at London's Wembley Arena with hubby Stephen Belafonte on her arm.
It was the first dazzling outfit of the night for Mel, who presented the awards with 'Xtra Factor' host Sarah-Jane Crawford.
She later took to the stage in another MacDonald creation - an embellished (and uber short) red dress.
Kicking the awards off, Mel said that this year’s MOBOs were all about girl power.
“Don’t worry it’s not a Spice Girl reunion – although I would LOVE that,” she told the crowd.
Among the winners at this year's awards was Sam Smith, who picked up three gongs, including Best Album for his debut longplayer, 'In The Lonely Hour', which was voted for by Twitter users.
As he collected his award, he said: “What is going on? That’s amazing. Thank you everyone on Twitter. I just want to thank every single person who wrote my record with me. It’s really a dream come true.”
FULL WINNERS LIST:
MOBO Best African: Fuse ODG
MOBO Best Reggae: Stylo G
MOBO Best HipHop: Krept and Konan
MOBO Best RnB/Soul: Sam Smith
MOBO Best Gospel: Living Faith Connection Choir
MOBO Best Jazz: Zara McFarlane
MOBO Best Grime Act - Stormzy (In association with BBC Radio 1Xtra)
MOBO Best Newcomer: Ella Eyre (In association with HTC)
MOBO Best Male: Sam Smith
MOBO Best Female: Jessie J
MOBO Best Intl: Beyoncé
MOBO Best Video: Skepta
MOBO Best Song: Sam Smith
MOBO Best Album: Sam Smith
MOBO Inspiration Award: Idris Elba