Bruno Mars Gets Down at Lollapalooza!

 Barry Brecheisen

Bruno Mars dancing with friends at the Grey Goose/Underground bash during Lollapalooza Weekend in Chicago.

Khloe Kardashian, hubby Lamar Odom and his kids, Destiny and Lamar Odom Jr., picking up UP2U gum by Mentos at the Teen Choice Celebrity Retreat in Hollywood.

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Liev Schreiber hanging on board the Edmiston Yacht with Ralph Lauren spokesman and polo champion Nacho Figueras in Sag Harbor, NY.

Melissa George celebrating her birthday with UV Vodka’s new cake flavor alongside at D Bar in NYC.

Aisha Tyler and Tabatha Coffey supporting Joico Hair Care Professionals at the City of Hope Gala in L.A.

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Jamie-Lynn Sigler helping JC Chasez ring in his 35th birthday by watching the performances at Beacher's Madhouse in L.A.

Scott Porter getting cozy with girlfriend Kelsey Mayfield after his performance in the benefit CATS for Cats at the VIP afterparty in L.A. 

Salma Hayek shopping for her upcoming vacation at Elyse Walker in Pacific Palisades, CA.

Faith Hill snapping up a Winter Kate silk kimono while shopping with her daughter at Chicago’s Sofia boutique.

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T-Pain sipping Cascade Ice Water at the KIIS FM Gift Room event in L.A.

Jay-Z, Alicia Keys and Swizz Beatz drinking Veuve Cliquot Yellow Label Champagne and tequila while their buddy Q-Tip DJ'ed at Yotel in NYC.

Foo Fighters frontman Dave Grohl taking in a Dirt Nasty (Simon Rex) performance at Chicago's newly opened hotspot, Board Room.

— Actor Dave Franco hanging out with Christopher Mintz-Plasse at Gilt City Better than Backstage Pool Party during Lollapalooza weekend in Chicago.

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— Style guru Kate Betts, dressed in Jeannie McQueeny, celebrating her first book, Everyday Icon, Michelle Obama and the Power of Style at Mister Collins inside One Bal Harbour Resort & Spa in Miami Beach.

Beth Stern talking about her new puppy that she adopted from the North Shore Animal League on the set of Fox News' Fox and Friends in NYC.

Jessica Simpson dropping off boxes of Jessica Simpson Collection clothing to the headquarters of Baby Buggy—a nonprofit founded by Jessica Seinfeld dedicated to providing underprivileged families the essentials they need to raise healthy and happy children – in NYC.

Mark Salling, Chris Colfer and Cory Monteith hanging out at the Thompson Beverly Hills Rooftop for the after-party of their new Glee 3D movie premiere in LA. 

— Jennie Garth and Eva Longoria playing the new Mystery Case Files: The Malgrave Incident, a new game for Wii from Nintendo, in Los Angeles.

Kate Hudson picking up some YSL Tribute platform sandals and a few Rag and Bone summer sweaters at Madison West 3rd Street in LA.

Theophilus London performing after DJ Mia Moretti warmed up the crowd during a Details Magazine party Santos Party House in NYC.

Kellan Lutz grabbing drinks with his entourage at the Belvedere Vodka Music Lounge this weekend at W Chicago City Center during Lollapalooza in Chicago.

Johnny Knoxville enjoying a low key night, enjoying some beers on the sundeck of the Gansevoort Park Rooftop in NY.

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