-- Bryce Dallas Howard, Mandy Moore, Anna O'Reilly and Anna Kendrick celebrating Howard as the face of the Kate Spade New York campaign at Chateau Marmont in L.A.
-- Karolina Kurkova and her husband Reid riding at SoulCycle in NYC to support Japan at SoulCycle's Tuesday Ride for Relief Day.
-- Michael Douglas looking very healthy while dancing in his seat at a performance of Broadway's Memphis in NYC.
PHOTOS: Stars on Broadway
-- Martha Stewart, Steve Buscemi and NYC's Mayor Michael Bloomberg all dining at Tom Colicchio's newest restaurant, Riverpark, in NYC.
-- Lauren Conrad drinking out of a GOBIE H20 water filter bottle while exercising in L.A.
-- Real Housewives of New Jersey's Caroline Manzo showing off her new Chelsea Taylor circle stack necklace at the Robert Verdi Luxe Lounge in NYC.
-- Oscar Winner Jennifer Hudson performing a 40-minute set at Atlanta's W Hotel Midtown for Hennessy Black's V103 Soul Sessions.
-- Penn Badgley checking out the Sony Ericsson Xperia PLAY smartphone at its launch party inside the Sony Ericsson Open's official kick-off event in Miami Beach.
PHOTOS: Gossip Girl stars, then and now
-- Lacey Schwimmer picking up SHRD products at Gavert Atelier salon in Beverly Hills.
-- Padma Lakshmi walking the red carpet with gal pals Susan Sarandon and Bridget Moynahan at the Endometriosis Foundation of America's 3rd Annual Blossom Ball in NYC.
-- Lindsay Lohan taking a turn in the deejay booth while DJ Phresh looked on at SL in NYC.
-- Taylor Momsen discussing her recent career change from actress to musician backstage at CARRERA Sunglasses Escape during the Samsung Focus Concert in Austin.
PHOTOS: Gossip Girl's biggest OMG moments
-- Hilary Swank and Something Borrowed author Emily Giffin celebrating their upcoming movie with champagne and chicken satays at Pranna Restaurant in NYC.
-- Wendy Williams posing with fans and drinking champagne at a party she hosted at the Pool After Dark at Harrah's Resort in Atlantic City.
-- Prince hanging out with a female friend, listening to DJ Journey and drinking Fiji water at Stone Rose Lounge in NYC.
-- Ricky Martin walking the ROKK Vodka Blue Carpet to receive his award at the 22nd Annual GLAAD Awards at NYC's Marriott Marquis.
-- Paul Giamatti avoiding cameras during the after party for Fox Searchlight & Everest Entertainment's film Win Win at The Chelsea Room in NYC.
-- Kathy Griffin celebrating the final performance of her Broadway show, Kathy Griffin Wants a Tony, with Bethenny Frankel and Lance Bass at SD26 in NYC.
-- Demi Moore sipping on Vita Coco while celebrating Purim with Ashton Kutcher and daughter Rumer Willis at Avenue in New York.
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