Shoes -- or to be more specific, high heels -- worn by Christina Aguilera, Gwen Stefani and Pink will soon be filled by unknown beauties.

The Pussycat Dolls, the red-hot Hollywood burlesque cabaret act that has also featured guest performances by Brittany Murphy, Carmen Electra, Christina Applegate, Kelly Osbourne and Nikka Costa (see [article id="1458472"]"Christina, Gwen Stefani, Dita Von Teese Help Bring Back Burlesque"[/article]), are searching for permanent singers to aid in recording an album of sorts.

"We're looking for really, really hot girls -- insanely beautiful girls with beautiful voices," choreographer Robin Antin, who founded the Dolls eight years ago, said Monday. "We're looking for a triple threat, or at least a double. They have to really, really sing and really, really dance. That's the beauty of the Pussycat Dolls. We already have a few girls who can sing and dance, a lot of really talented girls who've been a part of it for a long time, and we're adding to it."

The Pussycat Dolls are holding an open casting call on December 2 at CenterStaging in Burbank, California (details are available on their Web site). "We're going to build the act on the talent at hand," said Ron Fair, an A&M Records president and producer (Aguilera, Vanessa Carlton) who is overseeing the group.

Fair and Antin are executive producing the album and have already met with the Neptunes, Outkast, Rockwilder and Corey Rooney (Jennifer Lopez) about producing. They expect many of the Pussycat Dolls' past guests to participate, as well as other women, ranging from Mary J. Blige, Beyoncé and Nelly Furtado to Eve and Queen Latifah.

"That's what it's about, people wanting to be involved with the Pussycat Dolls," Antin said. "They all respect what I've been doing and know it's a different audience. I don't know if they will all be a part of it, but we'll have a good selection of people."

Musically, the album will blend a hodgepodge of styles with sexy themes.

"My influences are all over, from punk to rock to disco," Antin said. "I've always called it rock and roll burlesque because I started it purely as a burlesque-inspired show, but it started to change right in front of my eyes, it became more organically this rock and roll flavor with Gwen and Christina. And that's exactly what I've always wanted to do."

When the project is released, probably in the spring, it will be different than anything on shelves, Fair said.

"Don't call it an album. What we're making is going to be a surprise that involves music and visuals," he explained. "There's going to be some technological changes as well as creative changes in the way we go about it."

More important than the item being released will be the supporting performances surrounding it.

"It's not going to be your regular, you know, Destiny's Child goes on tour," Antin explained. "It's going to be a show. It's a theatrical, incredible show. You'll walk in and be surrounded by the whole vibe. I've always loved the whole underground feeling of it, and we're still holding onto that too."

The Pussycat Dolls will give a sneak peek at their new and improved performance on "A Kid Rock Christmas," which airs December 14 on VH1. The women, joined by Electra, perform the Christmas standard "Santa Baby," which they've also recorded for release.

"We went into the studio and these girls who are amazing dancers got a chance to sing and everything fit so well," Antin said. "It's so fun and so sexy, it has the bump and grind feel, but still contemporary. It's just fun."

A special performance Antin and a few of the Dolls did Sunday is also likely to pop up on TV in the spring.

"Jessica [Simpson] had a party for Nick and we sang Happy Birthday to him while she jumped out of a cake," Antin said. "It was funny."