Jessica Sanchez, Hollie Cavanagh and Skylar Laine like 'three little dolls' on 'American Idol'

There's some actual choreography here. And they're playing off one another vocally, unlike when Joshua Ledet and Phillip Phillips teamed up earlier tonight. It's a ton of fun and impressive to listen to.

"Weird arrangement, but you sang the hell out of it," says Steven Tyler. Jennifer Lopez calls it a "treat" to see them together, says "it was so cute, you're like three little dolls."