-- Sabrina Kleier-Morgenstern, Prince Lorenzo Borghese and Samantha Kleier-Forbes hanging out at the Kleier book signing for Hot Property hosted by One Thousand Ocean in NYC.
-- Chelsea Handler hiding out in her bungalow at the Fairmont Miramar Hotel & Bungalows in Santa Monica.
-- Jessica Alba and Chris Evans partying at The Beverly in L.A. to celebrate a pal's birthday.
PHOTOS: Celebs with Bieber fever
-- Justin Bieber checking out his suite complete with a basketball court at the W Mexico City.
-- Julianne Hough wearing Foot Petals at the Footloose premiere in L.A.
-- Karina Smirnoff using her South Beach Smoke electronic cigarette while exiting the Just Dance 3 party in L.A.
-- Real Housewives of New Jersey star Kathy Wakile passing out desserts at the Wetpaint entertainment one year anniversary party in NYC.
PHOTOS: Unbelievable Housewives moments
-- Maria Menounos being honored at at K9s Only West/Friends of L.A. Animals Shelters launch party.
-- Gabrielle Union listening to DJ Zeke Thomas as her boyfriend Dwyane Wade played in a charity basketball game benefiting Isiah Thomas's Mary's Court Foundation at FIU iin Miami.
-- Jersey Shore's Ronnie Magro listening to DJ Mel DeBarge at RDV Lounge in NYC.
-- Paul Walker, the new face of Davidoff Cool Water, hanging at an event for the fragrance at a private residence in Malibu.
PHOTOS: Wildest Jersey Shore moments
-- Nicole 'Snooki' Polizzi celebrating her one year anniversary with Jionni LaValle at STK Rooftop in NYC.
-- Foster The People and Bobby Moynihan partying till the wee hours of the morning to celebrate their performance on Saturday Night Live at Park Avenue Tavern in NYC.
-- Kevin Connolly learning to pour the perfect pint of Guinness Stout at the Guinness Storehouse in Dublin, Ireland.
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