JT & Beyoncé: 'Single Ladies' on 'SNL'!

Justin Timberlake showed off his moves on "Saturday Night Live" last night -- but his dancing didn't impress Beyoncé!

The "Love Stoned" crooner slapped on a leotard and black heels in a spoof of Beyoncé's video for "Single Ladies." Timberlake shook his stuff in the spoof as a background dancer during a "video shoot" with the actress/musician and director, played by funnyman Paul Rudd.