The youngest of the Kardashian clan interviewed stars at the ‘Twilight’ premiere earlier this week and had them singing karaoke to Justin Bieber — watch!

Kendall and Kylie Jenner got dared/asked by Ryan Seacrest to have the cast of The Twilight Saga: Breaking Dawn — Part One sing Justin Bieber‘s Christmas hit, “Under the Mistletoe” at the premiere Nov. 14…and they totally did it!

Most of the stars seemed completely confused by the request, but a few of them played along. Our personal favorite was Jackson Rathbone who looked like he was going to burst out laughing the entire time. Meanwhile, the adorable Cody Simpson actually gave it his all, which didn’t happen with anyone else.

Watch the cute vid above. Wouldn’t you have loved for Robert Pattinson to sing Bieber?

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