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25 April 2012, 14:50
The two pop stars will make cameo appearances alongside Hollywood director Tim Burton.
Justin Bieber and Lady Gaga will play aliens in the forthcoming movie, Men In Black 3.
Director Barry Sonnenfeld said the pair will both make cameos on an alien surveillance board in the film, which will also feature a guest spot from Dark Shadows director Tim Burton.
"In this [film] 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," he told Collider.
In previous films, Steven Spielberg and George Lucas have both made cameos on the alien surveillance board, while Men In Black 2 also featured a brief appearance from the late Michael Jackson.
Check out the Men In Black 3 trailer below:
Sonnenfeld admitted it was a challenge getting celebrities to appear in the franchise.
"The challenge is getting celebrities that are famous, will give you permission and won't be like 'Who's that guy?' in 10 years," he said.
Men In Black 3 goes on general release in cinemas in May and will once again star Will Smith as agent J, while Nicole Scherzinger also stars.