Holly Madison has crossed over to the dark side ... or at least her hair has!

The "Holly's World" star flaunts a brunette 'do in the new music video for her "Peepshow" co-star Josh Strickland's single "Report to the Floor" -- which also has appearances from show regulars Angel Porrino and Laura Croft.

Credit: Too Fab

Angel Porrino arrives at the grand opening of the Chateau Nightclub and Gardens at the Paris Las Vegas Hotel on March 5, 2011 in Las Vegas, Nevada.

Credit: American Superstar

Jayde Nicole and co-stars from the television show Holly's World Angel Porrino, Holly Madison and Laura Croft watch their co-star Josh Strickland's debut performance of his single, "Report to the Floor" at the LAX Nightclub at the Luxor Resort & Casino February 23, 2011 in Las Vegas, Nevada.

Credit: Zimbio

Holly's World stars Angel Porrino, Josh Strickland, Holly Madison and Laura Croft appear at the LAX Nightclub at the Luxor Resort & Casino for Strickland's debut performance of his single, "Report to the Floor" February 23, 2011 in Las Vegas, Nevada.

Credit: Zimbio

Holly Madison, Josh Strickland, and Angel Porrino arrive at the Tryst nightclub at Wynn Las Vegas to host a Valentine's Day event early February 13, 2011 in Las Vegas, Nevada.

Credit: Zimbio

Laura Croft, Holly Madison, and Angel Porrino pose for photos at the Holly's World season 2 premiere screening party at Planet Hollywood Resort & Casino on January 23, 2011 in Las Vegas, Nevada.

Credit: Wire Image

Angel Porrino arrives for the 5th anniversary of Carrot Top's show at The Luxor Resort and Casino in Las Vegas, Nevada on December 20, 2010.

Credit: Contact Music

Holly's World co-stars Holly Madison, Josh Strickland, Laura Croft and Angel Porrino (who brought along her son Roman) visited Santa at El Segundo Sol at The Fashion Show Mall.

Credit: Las Vegas Nightlife

Laura Croft and Angel Porrino arrive at The Cosmopolitan Of Las Vegas opening celebration on December 15, 2010 in Las Vegas, Nevada.

Credit: Wire Image

Holly Madison celebrated the "Holly" Days with the cast of Holly's World - Angel Porrino, Laura Croft, and Josh Strickland - at Buca de Beppo in Las Vegas on December 14, 2010.

Credit: Wire Image

Celebrating the release of “Harry Potter and the Deathly Hallows,” Holly Madison was spotted at the midnight premiere at the Brenden Theaters in Las Vegas last night (November 18).

The former “Girls Next Door” babe was joined by Angel Porrino, and both ladies were fully dressed in themed costumes as they hammed it up at the Palms Resort.

Credit: Celebrity Gossip

Laura Croft, Holly Madison, and Angel Porrino attended a performance by rock band Neon Trees at a charity masquerade ball benefitting Music Saves Lives at The Beatles Revolution Lounge at the Mirage Hotel & Casino early October 28, 2010 in Las Vegas, Nevada.

Credit: Zimbio