Bryce Dallas Howard, Mandy Moore, Anna Kendrick Party Together in L.A.

 Stefanie Keenan

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 Archie 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.

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.

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.

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.

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!