A star-studded cast was on hand for the premiere of The Tonight Show Starring Jimmy Fallon.

Karadashian, Lady Gaga , Mike Tyson and others were surprise guests on the show, and Kardashian posted photos of the stars backstage on her Instagram account.

She wrote: "Mike Tyson, Sarah Jessica Parker, Tracy Morgan, Joan Rivers, Gaga, Lindsay Lohan backstage at Jimmy Fallon tonight!"

And "You guys watching Jimmy Fallon tonight? Fun behind the scenes pic with these funny guys, Seth Rogan & Tracy Morgan."