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‘Grandfathered’ Stars Christina Milian, Josh Peck Prove They Are Beliebers on ‘Lip Sync Battle’ (Video)

Milian performs Justin Bieber’s ”Baby,“ while former ”Drake & Josh“ star asks: ”What Do You Mean?“

Christina Milian and Josh Peck have a lot in common.

Not only were they both child stars who went on to appear on John Stamos‘ short-lived Fox comedy “Grandfathered.” But they also both love Justin Bieber, which they proved in style Thursday night on “Lip Sync Battle.”

Milian opened the hit Spike show performing the 2009 pop classic “Baby.”

“This is for all those boys who broke your heart the very first time,” she told the audience, while Peck warned her: “Don’t mess up!”

The former “Drake & Josh” star went on dedicate his first lip sync to Bieber’s “What Do You Mean?” Peck nailed the performance by even crying at the end.

Bieber himself made a very memorable “Lip Sync Battle” appearance when he took on Deion “Primetime” Sanders last July. Sadly, even jumping on the “Crazy Train” with Ozzy Osbourne wasn’t enough to beat out the NFL Hall of Famer.

As for Thursday’s show, Milian returned for the second round inspired by another pop icon, singing Jennifer Lopez‘s “Waiting for Tonight.”

“I’m channeling my inner J-Lo,” she said, as she “dipped it low.”

Peck may have been cute and innocent on his Nickelodeon show but he sure knew how to get down and dirty for Sisqo’s “Thong Song” — complete with a white suit, a lime green thong and “Magic Mike” moves.

“You were swimming through an ocean of butts,” host LL Cool J marveled. “This was my dream, I feel like a Make-a-Wish kid,” Peck replied.

Needless to say, Peck’s impressive splits sealed the deal, and he was crowned champion.

“Lip Sync Battle” airs Thursdays at 10 p.m. ET on Spike.