Which Celeb Is Serenading Rob Pattinson?

Which star is singing to a life-size poster of R.Pattz? Guess now!

Celebrities really are just like us: They sing to life-size cardboard cutouts of Robert Pattinson, too.

This pop singer was performing at her concert last night when a fan handed her a huge cutout of R.Pattz.

The celeb, who got her start on American Idol, proceeded to serenade the cardboard version of the world's hottest vamp.

Think you know who wants a piece of Rob? Find out after the jump!

It's Kelly Clarkson.

You can check out her performance of "I Want You" to the poster-size R. Pattz here!