Lady Gaga is set to make her big screen movie debut in the upcoming Men In Black sequel, according to a Brazilian movie news website.

Editors claim Will Smith let it slip that the Poker Face singer would appear in the film during a promotional trip to Rio last week.

He reportedly told ElCorilloRD.com: "We have a couple of celebrity cameos, but I cannot reveal who they are. We must keep as a surprise that Lady Gaga appears."

The website reports Smith has been told not to reveal any of the other cameos lined up for the film.

Josh Brolin, Tommy Lee Jones and Emma Thompson are all set to star as alien-fighting secret agents. Boxing legend Mike Tyson and beloved Hollywood Golden Girl Betty White are also rumoured to be making guest appearances in the highly-aniticpated 3D adventure, due for release later this year.

So far the hit franchise has made well over $1 billion globally.