-- 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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