Associated Press

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Related Articles: Girls Next Door News

• Hef's new girlfriend Crystal Harris works out two hours
  a day to stay in shape
• Playboy bunny Holly Madison says living in the Mansion
  drove her to plastic surgery
• Girls Next Door Bridget installs trapeze in her hallway
  for exercise

Hugh Hefner has announced his Halloween night bash will be a fundraiser to raise money for fallen soliders.

What better way to raise money and awareness for a good cause than throw a party at the world's sexiest mansion with the hottest girls around?

The 83-year-old king of naked woman and bunny girls is hosting the event on October 31 and is promising Hollywood's hottest celebrity guests and the sexiest women of the Playboy empire - Most obviously, celebrity girlfriends ands stars of Girls Next Door, twins Karissa and Kristina Shannon and Hef's main squeeze Crystal Harris.

Also in attendance will be over 40 servicemen to enjoy the party on the house since the price to enter is a bit steep.

Fox News quoted Executive Director of the Halloween 2009 Bash Jose Dominguez as saying, "Hef was kind enough to let the Wounded Warrior Project be a beneficiary on Halloween. Proceeds will help severely wounded veterans that have recently served in Afghanistan and Iraq."

Tickets to the part will start at $1,000 a ticket and VIP entry can run up to $15,000 per person.

“Halloween is the most sought-after night at the Mansion so it was a good opportunity to support our veterans and enjoy a great party at the same time," Dominguez said.

But how ole' Hef keeps up is as mysterious as the aura that surrounds him at the mansion.

While no reports clue us in on a fitness routine for the Playboy guru, the ladies of the mansion have confessed to working out to keep up with their beauty - On the inside and hot.

Kendra Wilkinson (now, Baskett) was happy to announce her stripper pole and stripper pole workout soon after leaving the mansion while former Girls Next Door co-star Bridget Marquardt installed a trapeze in her new house to stay fit.

Hef's former main squeeze, Holly Madison, even produced her own Girls Next Door workout video, filmed at the mansion (see the clip below) and Crystal Harris, Hef's new British girlfriend keeps up the Girls Next Door pace by maintaining daily workouts with the twins.

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YouTube Video: Holly Madison's Girls Next Door workout