The 31-year-old actor kicked off the dare in New York City.
Dave Franco is challenging his celeb pals to "find their nerve."
As a way to promote his latest film, Nerve, the 31-year-old actor is daring people to record themselves singing in public and post it to their social media accounts with the hashtag "#FindYourNerve."
WATCH: Dave Franco & 8 Stars Who Stole Out Hearts From Their Famous Siblings
Dave kicked off the challenge in New York City, singing Backstreet Boys' "I Want It That Way" in the middle of an Apple store. He later shared the video to Facebook on Wednesday, writing, "I challenge James Franco, Alison Brie and Chris Mintz-Plasse to #FINDYOURNERVE and embarrass yourself by singing in public too. You have 24 hours. GO!"
And it looks like the challenge has already been accepted!
Dave's older brother, James Franco, performed the dare inside a convenience store with two friends. His song of choice? Justin Bieber's "Sorry."
Check out those hip movements!
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Christopher Mintz-Plasse, who starred in Neighbors with Dave, belted out Tina Turner's "What's Love Got to Do With It" in the middle of a movie theater lobby in Los Angeles.
Alison Brie, Dave's fiancée, showed off her singing skills with Whitney Houston's "I Wanna Dance With Somebody" near the fresh produce section. Girl's got pipes!
Meanwhile, Dave's Nerve costar, Emma Roberts, was channeling her inner '90s girl by singing the Spice Girls' 'Wannabe" on a subway in the Big Apple.
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See more hilarious #FindYourNerve moments below:
WATCH: Emma Roberts Plays Coy on Kissing Both Franco Brothers
As we patiently wait to see what dares are pulled in the actual film, which hits theaters on July 27, watch the video below to hear Emma gush to ET about kissing both Franco brothers!