Sightings: Messing, Spears and Zellweger

Debra Messing hugs a pooch, Renée Zellweger gets her nails done, and Debi Mazar does din-din

FOUR-PAWS CLUB: Debra Messing, playing with a dog on the set of her new television series, The Starter Wife.

ROBIN'S HOOD: Britney Spears, Halle Berry, Sean "Diddy" Combs and Raven-Symoné, checking out Robin Thicke's concert at the House of Blues on L.A.'s Sunset Strip.

YOU'VE GOT NAIL: Renée Zellweger, getting a manicure at Bella Nails in Beverly Hills.

ITALIAN JOB: Debi Mazar, having dinner at Mario Batali's Osteria Mozza in Hollywood.

T-TIME: Taryn Manning, chilling by the pool at Project Beach House in Malibu during the Tt Clothing party.

GUEST SERVICES: R&B singer Keyshia Cole, drinking a Belvedere vodka cocktail at Guest House in NYC.

BLOODY GOOD: Donald Faison, enjoying a Bloody Mary while having dinner with girlfriend CaCee Cobb at Magnolia in Hollywood.

COMING UP

FREE TO BE: Selena Gomez, Eva Longoria Parker and Fergie are among the celebs expected to stop by Backstage Creations' Celebrity Retreat swag lounge during Sunday's NCLR Alma Awards in Pasadena, Calif.