Inside Hef's Super-sexy Sin City 83rd Birthday: A 'Beaten Up' Holly & Hef Reunite for First Time Since Split, Plus Why She Vows Never to Go Naked Again | Pop Tarts 'Scene and Herd'

Inside Hef's Super-Sexy Sin City 83rd Birthday: A 'Beaten Up' Holly & Hef Reunite for First Time Since Split, Plus Why She Vows Never to Go Naked Again

The American Country Music Awards certainly brought a lot of extra buzz to Las Vegas over the weekend, but what really had temperatures soaring was Hugh Hefner’s 83rd Birthday at the Palms Resort & Casino. The festivities kicked off Saturday afternoon with a Palms Place pool party, hosted by (wait for it) Hef’s former flame, Holly Madison.

"I haven’t seen him since I left the mansion," Madison told Tarts before his arrival. "And it is my first time filming "Girls Next Door" as a single lady so that’s exciting."

But Madison wasn’t the only ex girlfriend who came to celebrate the special day, surprisingly Kendra Wilkinson and Bridget Marquardt also strutted in (with their new lovers) to help Hef and his three new leading ladies Crystal Harris, Karissa Shannon & Kristina Shannon spice up Sin City and the birthday boy couldn’t have been more beside himself.

"As you can tell I am very, very happy. To celebrate my birthday with new girlfriends and former girlfriends is perfect, its wonderful," he said. "I’ve had a life well-lived with so much satisfaction, I enjoy just looking back."

(Speaking of which, we couldn't help but keep a close eye on how the new and the old bonded and while chances are they probably aren't necessarily BFFs, things appeared to be very civil and no claws came out!)

However when we asked what Madison missed most about mansion life her response was a love affair of a different kind.

"The zoo, the mansion has a fantastic zoo with birds and monkeys -- I used to work in the zoo a lot and was really close to the zoo staff," she said. "I fancied myself as an amateur zoologist."

But Hef and the crazy creatures aren't the only things Miss Madison has moved away from, she also promised Pop Tarts that her days of baring that bangin’ body are over ... Sorry guys!

"I’m never getting naked again," she vowed. "I’m over it, I’ve done it so many times. It is time to switch it up."

Kendra on the other hand hasn’t ruled out posing for Playboy again -- however conditions do apply.

"If Hank (Baskett, her fiancé) shoots the spread I will do it again," Wilkinson told Tarts. "He has actually been practicing his photography skills. I’m a little more conservative nowadays, so I'll pose for Playboy but only if Hank takes the photographs."

On the note of posing, Madison happily showed off her simply sensational swimsuit body thanks to DWTS (even though she told us that she was "beaten up" and looked "disgusting with all the bruises"). But it seems even having been thru several seasons of "Girls Next Door" and the grueling ABC dance show, the 29-year-old isn't ready to escape the reality arena.

"I’m developing my own reality show that I’m producing too, it’s going to be about me and my friends here in Vegas," Madison added.

The busty blonde later joined fellow former flames Bridget and Kendra to surprise their ex-boyfriend with a custom birthday cake which was provided by Kerry Simon of Simon at Palms Place. In the evening Hef and all the girls had dinner at N9NE steakhouse before hitting up the Playboy Club. The publishing icon then partied in Moon Nightclub until the wee hours where Bridget sang him an ultra-sexy Marilyn Monroe-style rendition of Happy Birthday. Phew, so how does an 83-year-old manage to bunny hop around so much?

"Surrounding myself with beautiful women keeps me young," Hef assured us with a cheeky smile.

Pop Tarts 'Scene & Herd'

Demanding diva or pore perfectionist? Katherine Heigl spotted on the set of her new film "5 Killers" in Cannes, France using her Crystalift Microderm Abrasion machine on Wednesday.

Perrey Reeves, Jane Kaczmarek and Kristen Bell at Rodeo Drive's La Perla shopping party to benefit "Clothes Off Our Back" charity on Wednesday night.

With a star painted over her left eye, Lady Gaga hit up Koi Los Angeles on Wednesday night with Perez Hilton and ten others. David Spade sat with pals at a table nearby.

Rainn Wilson and Michael C. Hall having a quick dinner together at West Hollywood's NOBU on Wednesday night.

Nicky Hilton, Janice Dickinson, Anne Hathaway, Rachel Zoe, Rita Wilson & Joan Collins at the Los Angeles premiere of "Valentino: The Last Emperor" at the LACMA on Wednesday evening.

Plain White T's rocking out with a sold-out show on Wednesday in Wasted Space at Sin City's Hard Rock Hotel & Casino.

Comedian and actor Eddie Griffin enjoying Pravda vodka cocktails with his posse at REVOLUTION lounge in Las Vegas on Wednesday.

Former pop prince Aaron Carter at West Hollywood's AREA nightclub on Wednesday to host the Gith PR Industry Mix.

Janice Dickinson scooping up some frozen desserts at Yogen Fruz in Beverly Hills on Thursday.

Megan Fox donning the new Alice + Olivia Pax Pointelle Vest while out and about in the streets of Los Angeles on Thursday.

Paris Hilton strutting around Oceana Santa Monica in a leather bikini on Thursday afternoon.

Dennis Quaid out to support "So You Think You Can Dance" judge Mary Murphy's cameo in the 2009 Coca-Cola Refreshing Filmmaker's Award winning short film "Meanwhile..." at Showest in Las Vegas on Thursday.

Justin Long and his brother dining at Yellowtail Sushi Restaurant & Bar at Bellagio in Vegas on Thursday night.

Bette Midler and a posse of pals enjoying sushi on Thursday at Sin City's Simon at Palms Place.

"Star Trek" star Chris Pine and actress Sienna Miller at a private party at Strip House inside Planet Hollywood Resort & Casino on Thursday.

Audrina Patridge winning an acting award (gasp) at Showest in Vegas on Thursday at the 2009 Coca-Cola Refreshing Filmmaker's Awards. "The Hills" hottie scored Female Star of Tomorrow for her role in "Sorority Row".

Carmen Electra and Rob Patterson, Shane West, John Starks of the NY Knicks and "Top Model" Caridee English launching the very low calorie vitaminwater10 at a pop-up store in NYC's NoHo on Thursday evening. West was also spotted sweating it up earlier in the day at the vitaminwater10 gym in Union Square Park.

"DWTS" starlets Kym Johnson and Lacey Schwimmer chilling out at jeweler Pascal Mouawad's Beverly Hills mansion on Thursday night.

Prince (and his leading lady) making a sneaky, late-night appearance at Hollywood hotspot Teddy's for Jazz Night on Thursday. The music icon and his lover held hands and sat alone at a secluded VIP table (kept guard by two security men) and laid-low while enjoying the live music.

Ted Allen delivering thousands of loaves of bread to the Yorkville Common Pantry in New York City on Friday to launch the Bread Art Project -- a national hunger relief initiative benefiting Feeding America.

Good Charlotte frontman Joel Madden taking over the turntables of Prive Las Vegas on Friday while Friday Night Lights star Jesse Plemons came in to celebrate his 21st birthday, accompanied by his co-star Scott Porter.

Kenny Chesney spotted in Playboy Club and Moon Nightclub, inside the Palms Casino Resort on Friday night. The country star was presented with the Playboy Key by two Playboy Bunnies. (FYI - the key allows him exclusive membership at the Palms Casino Resort including Playboy Club, Moon Nightclub, Rain Nightclub, ghostbar, Palms Pool & Bungalows, Pearl concert venue and more. Other keyholders include Matt Damon, George Clooney, Brad Pitt & Paris Hilton).

Dennis Quaid, Greg Kinnear and Matthew Fox enjoying the casino party pit at Hard Rock Hotel & Casino. Earlier in the evening, Quaid was seen inside AGO as well as dining with Kinnear at Nobu.

Gavin Rossdale performing hits for a packed house at Las Vegas's LAX on Friday night. Among the crowd was birthday blogger Perez Hilton who dined at Social House before hitting up LAX and in the early hours moved up The Strip to PURE where the Las Vegas Pussycat Dolls presented him with a sexy dance and birthday cake.

Oscar-winning actor Adrien Brody and Greek shipping heir Stavros Niarchos (better known as Paris Hilton's ex) enjoyed Grey Goose cocktails with a large party of friends at VIP table on the dance floor of Aura nightclub in the Bahamas.

Hillary Scott celebrating her 25th birthday with her Lady Antebellum band mates Charles Kelley and Dave Haywood at The Bank nightclub at the Bellagio in Vegas on Friday night. The group partied with their country star pals including Kenny Chesney, Kellie Pickler, Rascal Flatts’ Gary LeVox, John Rich, Luke Bryan, Jamey Johnson, Emily West, Holly Williams, and Matt Stillwell.

Brenda Song, star of Disney Channel's hit sitcom "The Suite Life of Zack & Cody," celebrating her 21st birthday at The Bank on Friday. The actress squealed with excitement when her Jean-Philippe Patisserie cake was presented to the tune of Flo Rida’s trademark anthem, "Low." (There was some chatter in the club that the rapper is her Brenda’s new beau and he apparently missed his flight to Vegas to join her in the festivities.) Bradley Cooper was also presented a congratulatory cake at the club for winning Comedy Star of the Year at the ShoWest Awards.

2008 Miss USA Crystle Stewart and nine 2009 Miss USA hopefuls visiting cancer patients and families at Nevada Cancer Institute’s Bottles of Hope support group on Saturday.

Hugh Hefner celebrating his 83rd Birthday at Palms Place on Saturday alongside his three current girlfriends as well as former flames Holly Madison, Bridget Marquardt and Kendra Wilkinson. Also sporting a bangin’ bikini body at the bash (she just had a baby!) was 2005’s Playmate of the Year, Tiffany Fallon.

Hillary Scott, lead singer of country group Lady Antebellum and Aaron Rodgers of the Green Bay Packers spotted enjoying dinner together at AGO before heading over to Body English at the Hard Rock Hotel & Casino where they danced together in the booths on Saturday evening.