Ana DobrijevicPink and Carey Hart may have been in Vegas to celebrate their four-year anniversary, but it wasn't about hard partying and gambling.
The two had dinner at Rio's Café Martorano, before heading inside the Mirage to watch The Beatles LOVE by Cirque du Soleil.
The LOVE did not end after the show. Once it was over, Pink and Carey went backstage to meet the cast, where one of the Nowhere Men presented Pink with a bouquet made of flowers featured at the couple's 2009 Costa Rican nuptials.
Who else have we spotted out and about? Keep reading to find out why Jessica Biel boarded a plane for Africa with Emilie Hirsch, which reality show Brooke Shields is a fan of and what Kevin Federline was doing in Vegas, too...
ROCKER CHICKS: Khloé Kardashian Odom and Carmen Electra, enjoying Kid Rock's SWAGG VIP concert at Las Vegas' Hard Rock Hotel.
DANCING QUEEN: Brooke Shields, telling Gilles Marini and Cheryl Burke how much she loves DWTS at the LG Lotus Elite Party at the Palms Place Hotel Spa in Las Vegas.
HOW FITTING: Alleged Tiger Woods mistress Jaimee Grubbs, belting out Madonna's "Material Girl" at Saddle Ranch on the Sunset Strip.
GO TELL IT ON THE MOUNTAIN: Jessica Biel, Emile Hirsch and Kenna, boarding a plane at LAX to Africa to climb Mt. Kilimanjaro for Summit on the Summit. You can follow their journey here.
YUM! David Archuleta, celebrating his birthday with a Cold Stone Creamery Strawberry Passion Cake at his family's home in Utah.
HAIRY SITUATION: Lacey Schwimmer, getting her hair blown out by stylist Jennifer Ellenberg and stocking up on UNITE conditioner at Suburbia Salon in L.A.'s Studio City.
BLING BLING: Channing Tatum and Jenna Dewan, browsing the collections at Energy Muse Jewelry together in Torrance, Calif., where Jenna picked out a High Priestess necklace.
HOOP DREAMS: Dave Annable and Odette Yustman, never leaving each other's side at the Original Retro Brand's "'Twas The Night Before..." BCS party at the Kress in Hollywood.
HAIR AFFAIR: Nicky Hilton and mom, Kathy, getting their hair done by Michael Boychuck at Boychuck's AMP Salon at the Palms in Las Vegas.
SALE AWAY: Lindsay Lohan, checking out the sales rack at Intermix on Robertson Boulevard in West Hollywood.
ELEGANT EATING: Ashley Olsen, dining at POSH Improvisational Cuisine in Scottsdale, Ariz.
VIVA TEQUILA: Kevin Federline and his longtime gal-pal, Victoria Prince, lunching at Cabo Wabo Cantina in the Miracle Mile Shops in Las Vegas.
WHAT A BULLGAME: Ryan Seacrest and Molly Sims, hanging out with a slew of University of Texas fans at West Hollywood's Mondrian Hotel prior to their BCS Championship loss to Alabama.
SHADY BUSINESS: Nick Cannon, sporting a pair of Oakley sunglasses while speeding around Sonoma, Calif.'s Infineon Raceway in an Audi R8.
CELEBRATION TIME: Jessica Alba and Cash Warren, dining at Gardens of Taxo Mexican Restaurant in West Hollywood for a friend's birthday.
—Additional reporting by Ashley Fultz, Lindsay Miller, Brett Malec, Melana Scantlin, and Allison McNamara
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In honor of Pink and Carey Hart's four-year anniversary, check out our Celebrity Weddings 2009 photo gallery.