-- Kelly Osbourne and David Arquette partying at The Bank Nightclub in Las Vegas.
-- Joey Fatone partying at the Playboy party at Prime in Louisville, KY.
-- Good Charlotte's Joel and Benji Madden rocking out to a packed crowd at the Maxim/Cuervo Games in Scottsdale, AZ.
-- Angie Harmon celebrating Mother's Day by picking up jewelry at Santa Monica Place with friend and celeb stylist, Cristina Ehrlich.
PHOTOS: What these celebs love about beinga mom
-- Aubrey O'Day sipping Evan Williams Mint Julep at the Maxim and Black Rock Stables party in Louisville, KY.
-- American Idol alums Jordin Sparks and Kris Allen rocking the house the night before the Kentucky Derby at The Mint Jubilee in Louisville, KY.
-- Neon Trees playing their hit song "Animal" at Operation Smile's event at NYC's Cipriani Wall Street.
-- Kate Gosselin picking up goodies at the Style Icon Luxury Gifting Suite at the Galt House in Louisville, KY.
PHOTOS: Kate Gosselin's meanest faces
-- Chef Daniel Boulud standing on the bar of his own Boulud Sud during the afterparty of the James Beard Awards in NYC.
-- Bruno Mars celebrating the launch of his Doo-Wops and Hooligans tour at 1Oak in NYC.
-- AnnaLynne McCord and Kellan Lutz drinking 901 Tequila during a Cinco De Mayo party at Greenhouse in NYC.
-- Julie Benz enjoying a custom blended tea by the Teaologist at the Galt House Hotel & Suites on her way back from The Oaks in Louisville, KY.
-- Jake Gyllenhaal, Marcus Mumford and Carey Mulligan dancing to DJ Questlove's set in between their turns bowling at Brooklyn Bowl in New York.
PHOTOS: Secret celeb BFFs
-- Jersey Shore's Angelina Pivarnick chatting with fans about Whirl-A-Style products and "Fashion-On-The-Go" hair styling services at a Duane Reade in NYC.
-- Christina Ricci attending the Fourth Annual TV Academy Honors in Beverly Hills.
-- Russell Brand spending Cinco de Mayo noshing on a veggie quesadilla at Lime Fresh Mexican Grill in South Beach, Miami.
-- Maria Menounos stopping in the Keratin Complex by Sean Donaldson pop-up salon for a quick touch up during the LOEWS Miami Beach Girlfriend Getaway.
-- Something Borrowed star Colin Egglesfield and his brother making a late-night stop at Chicago's beer centric hotspot Public House.
-- Bethenny Fankel indulging in bibimbap and scallion pancakes at Woo Lae Oak in NYC's Soho neighborhood.
-- Angela Martini overheard discussing her recent photo shoot for GQ Italia with fellow model Jessica White at Bar Pitti in NYC.
-- Jay-Z hanging in the deejay booth with DJ Ruckus before taking the stage with Kanye West at the "MoMa Party in the Garden" in NYC.
PHOTOS: Beyonce and Jay-Z's romance
-- Christina Milian spending quality time with her mother Carmen and daughter Violet at the 3rd Annual On the Go Beauty by Joico event in L.A.
-- Lil' Jon celebrating Cinco de Mayo with Don Julio Tequila at a private party in NYC.
-- Eva Longoria enjoying Grey Goose vodka cocktails at a gala celebrating the Rally for Kids with Cancer Scavenger Hunt at Eden Roc Renaissance Miami Beach.
-- Grey's Anatomy actress Ellen Pompeo and husband Chris Ivery dining at hotspot Zuma Miami.
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