Rihanna photobombs 'Full House' reunion, John Stamos 'strips' down to yogurt undies [PHOTOS]: Bob Saget, Dave Coulier 'bromance' continues before Super Bowl Ad debut [WATCH]

The boys of the hit 1990s sitcom "Full House" are back!

John Stamos, Bob Saget, and Dave Coulier appeared on a recent episode of "Good Morning America" - and things got pretty epic.

First, the hilarious trio was photobombed by "Diamonds" songstress Rihanna:

@GMA2h: "How's this for a morning mashup: @rihanna photobombing @DaveCoulier, @JohnStamos and @bobsaget! #RihannaOnGMA."

@GMA: "And no selfie session would be complete without a duckface...we thank you, @rihanna. #GMAFullHouse #RihannaOnGMA."

@GMA: "There are no words for how much we love this: #GMAFullHouse #RihannaOnGMA."

And apparently Stamos fell in love:

johnstamos: "Finally met my childhood crush- @rihanna - wait, strike that reverse it. #hot."

The guys reunited on "GMA" Wednesday (Jan. 29) to promote their new commercial for Dannon Oikos Yogurt (which will premiere during the Super Bowl on Sunday, February 2nd). Check out the amusing (and somewhat naughty) clip here:

Definitely staying true to their characters!

Stamos is so proud of his Greek Yogurt inspired-undies, that he even stripped on "GMA" to show them off! Host Lara Spencer was shocked (but in a good way). Now THAT'S good promotion!

Check out the "Full House" segment here. Gotta love these guys: