Jessica Alba, Ariana Grande and Demi Lovato will be among the celebrities judging gender benders on hit U.S. reality show RuPaul's Drag Race this spring (15).

The three stars have been lined up as guests for the upcoming seventh season of the show, alongside Mel B, Jordin Sparks, Olivia Newton-John and moviemaker John Waters.

Drag icon RuPaul will be joined by two new full-time judges - Queer Eye for the Straight Guy star Carson Kressley and Tv personality Ross Mathews.

The new season will begin in March (15).