SENSATIONS – 01/24/08

UFC fighter Tito Ortiz, celebrating his 33rd birthday with girlfriend/adult entertainment star Jenna Jameson and friends Friday at the CatHouse (Luxor). Jameson highlighted the night by serenading Ortiz with her best Marilyn Monroe rendition of "Happy Birthday" after being rolled in on a six-foot-high cake. Jameson then performed a choreographed number with the CatHouse Coquettets. Joining the party were former boxing champion Mike Tyson, and mixed-martial artists Tikki Ghosn, Rob McCullough and Troy Mandaloniz.

Former NHL star Wayne Gretzky, dining with friends Friday at Fix restaurant (Bellagio).

Actress Tiffani Thiessen, celebrating her 34th birthday at Pure nightclub (Caesars Palace) on Friday. Thiessen dined at Social House restaurant (Treasure Island) before heading to Pure. Also at Pure: Actress Tatyana Ali, who was celebrating her 29th birthday with friends, boxer Zab Judah, Washington Redskins star Marcus Washington and former NFL standout Simeon Rice.

Former United States soccer star Cobi Jones and former NFL quarterback Jay Fiedler, checking out LAX nightclub (Luxor) on Friday. Also at LAX: Drummer John Dolmayan of rock group System of a Down and celebrity chef Kerry Simon.

Singer Adam Levine of the music group Maroon 5, stopping by the Playboy Club (Palms) on Friday with a group of friends.

DJ AM, dining Friday at Social House restaurant (Treasure Island).

Singer Melody Thornton of the music group Pussycat Dolls, stopping by Moon nightclub (Palms) on Friday.

Comedian Bobby Slayton, checking out the grand-opening party Friday at the Hawaiian Tropic Zone inside the Miracle Mile Shops at the Planet Hollywood Resort.

Cleveland Browns quarterback Brady Quinn, checking out Tryst nightclub (Wynn) on Friday.

Diane Tucker, Mrs. World 2007 from Arizona, stopping by Blush Boutique Nightclub (Wynn) on Friday with several Miss America pageant coordinators and guests.

Actress Leighton Meester from hit TV show, "Gossip Girl," hosting the evening's festivities Friday at Tao Las Vegas (Venetian). Meester was joined by "Gossip Girl" co-star Nicole Fiscella. The pair dined at Tao Asian Bistro before heading upstairs to Tao nightclub.