Justin Timberlake struggled to keep a straight face during a hilarious Tv comedy sketch with Steve Carell on Wednesday (13Mar13) after the funnyman cracked jokes about the singer's former 'N Sync bandmates Joey Fatone and Lance Bass.

The SexyBack hitmaker has been appearing on America's Late Night With Jimmy Fallon all week (begs11Mar13) to promote his new album, The 20/20 Experience, and he joined Wednesday's guest Carell and host Fallon for a segment called, Real People, Fake Arms, a mock Canadian soap opera based in a suit store.

However, Timberlake couldn't help but sneak a smile as the Crazy, Stupid, Love actor, portraying the store manager, poked fun at Fatone and Bass, who revealed he was gay in 2006, by naming different types of formal wear after them.

Referring to the Bass suit, Carell quipped, "It's been in the closet for years, but I finally decided to take it out."

Timberlake also showed off his comedic chops by donning a white wig for a musical sketch, which poked fun at Doobie Brothers veteran Michael MCDonald; the singer joined Timberlake and Fallon for the skit, during which the three 'MCDonalds' performed a rendition of children's nursery rhyme Row, Row, Row Your Boat.