WATCH: John Krasinski and Jason Segal With Blowup Doll and Karaoke

John Krasinski and Jason Segel crashed a bride-to-be’s bachelorette party last weekend and gave her a show she’ll never forget.

The party was at a bar in Ann Arbor, Michigan …. the girls asked the boys to sing and they would never say no, right?  They busted out Brown Eyed Girl… and the bride was thrilled… um, I would be too!

Watch the video HERE.