03/23/2009 AT 07:10 PM EDT
Pussycat Doll Nicole Scherzinger and Kid Rock will both get in the ring – but only to sing – at the 25th anniversary of Wrestlemania on April 5 at Houston's Reliant Stadium, PEOPLE can exclusively reveal. While Sherzinger, 30, will open the show with "America the Beautiful," Kid Rock, 38, will sing a medley of his hits including "Bawitdaba" and "Cowboy." Also expected in audience: wrestling fan – and star of The Wrestler, Mickey Rourke.
– Marisa Laudadio