Wonder what Fergie thinks about this.
In a new behind-the-scenes clip for Nickelodeon's Fanboy & Chum Chum, Josh Duhamel and Jamie Kennedy show off their goofy sides, wearing their underpants outside of their pants!
PHOTOS: How these stars got their lucky breaks
"Why is it so awesome working with Fanboy and Chum Chum?" Duhamel, 38, asks.
"Those guys are our idols," Kennedy, 41, quips of the animated characters. "We wanna be just like them."
PHOTOS: Fergie and Josh's wedding album
Check out Duhamel and Kennedy -- wearing their underwear on the outside of their pants -- in the clip above!
Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly
Joe Manganiello parties with new love Sofia Vergara and her family in Miami on today's Celebs Gone Social.
Cameron Diaz, Rumer Willis, and Ellie Goulding all get an F on this week's Fashion Offenders.
Chrissy Teigen, Katy Perry and Lady Gaga spotlight their pooches on today's Celeb Gone Social.
See some of the cutest moments from Prince George's first year.
Let's check out some of Eva's tactics behind her baby bump secret on Replay hosted by Wonderwall's Kirby Kristen.
Selena Gomez celebrates her birthday early with a helicopter ride in Italy with new pal Cara Delevingne on today's Celebs Gone Social.
Derek and Julianne Hough share behind-the-scenes clips from their Move Live On Tour on Celebs Gone Social hosted by WW's Chris Gardner.
Find out what happened to the stars of 'Garden State' after they made the hit indie film.
© 2014 Microsoft