'Men in Black 3' star Will Smith already spilled the beans that Lady Gaga would be making a cameo in the third installment of the extraterrestrial movie franchise, but now the word on the street is that Justin Bieber has been added to the list of 'MIB 3' celebrity cameos. The best part? Bieber and Gaga aren't set to play just themselves, but aliens from another planet!

According to a report from Star Pulse, the Biebs and Mother Monster will portray "aliens who sit on a surveillance board, alongside kooky filmmaker Tim Burton." Could this really get any better? Gaga and Burton are definitely eccentric, so seeing them as aliens in a film doesn't seem all that out of the norm, but adding Bieber to this mix will surely make for an extra interesting scene.

'MIB 3' director Barry Sonnenfeld talked about their cameos, saying, "In this (installment) there are a few people that you'll see up on the surveillance board including Lady Gaga, Tim Burton, who probably knows more about aliens than I do, and let's see who else... Justin Bieber."

We can't wait to see this! We wonder if Bieber will have an extra head like Johnny Knoxville did in the second film, or if Gaga will turn into some kind of dazzling alien goddess who runs her own planet. We'll just have to wait until May 25 to see what the 'MIB' masterminds have cooking.

Bieber and Gaga aren't the first music superstars to have appeared in a 'Men in Black' flick alongside Agents K (Tommy Lee Jones) and Agent J (Smith). Michael Jackson showed off his acting chops by portraying a suited up fed in the second movie, and Nicole Scherzinger will also reportedly have a part in the newest 'MIB' movie.

Watch the 'Men in Black 3' Trailer