-- 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.

PHOTOS: Khloe and Lamar's cutest moments

-- 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.

PHOTOS: Another former *NSYNC member's style evolution

-- 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.

PHOTOS: Stars gone country

-- 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.

PHOTOS: Michelle Obama's style

-- Style guru Kate Betts, dressed in Jennie 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.

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