Jennifer Lopez: 'Dance Again' Video Preview!

Judge Jennifer Lopez shows off some leg during the American Idol Season 11 Top 8 Live Performance Show on Wednesday (April 4) in Hollywood, Calif.

The 42-year-old entertainer wore super chic Lanvin top/skirt/shoes. She accessorized with a Solange Azagury diamond ball necklace, CORA yellow diamond ring 55 karats (worth $2.5 million), Norman Silverman diamond by the yard, and Jennifer Zeuner crosses.

Jennifer and ex Marc Anthony will perform together at ¡Q’Viva! The Chosen Live, a new Latin cultural production directed by Jaime King. The show will debut at the Mandalay Bay Events Center in Las Vegas Saturday, May 26.

Below is a preview of Jennifer‘s new video for “Dance Again.” Look out for her boyfriend, dancer Casper Smart! The vid will premiere tonight during American Idol!

FYI: J.Lo wearing the blue Arielle dress from Rachel Zoe‘s prefall collection.