Sightings: Rihanna and Jay-Z's Fishy Business

SUSHI'S FINEST: Rihanna and Jay-Z, dining with five others at Hollywood sushi restaurant Katsuya, where they enjoyed miso cod, baked crab hand rolls and very expensive Houereki sake. Also having dinner at the same time, but separately, were Jessica Simpson and Aubrey O'Day.

HORSING AROUND: Justin Timberlake and Jessica Biel, having a late Sunday lunch at the Polo Lounge in the Beverly Hills Hotel.

GETTING GIRLY: 90210’s AnnaLynne McCord, getting red carpet-ready for the W Hoboken’s opening of the Chandelier Room, at the Patrick Melville Salon and Spa in NYC.

Which Gossip Girl hottie was spotted helping a supermodel celebrate her birthday in NYC?

SUPERMODEL EXTRAVAGANZA: Chace Crawford, Ryan Gosling, Hugh Grant and Jessica Szohr, celebrating supermodel Jessica Stam’s birthday at the Gates lounge in NYC, where guests enjoyed Karma sparkling wine, Rose’s cocktails and cupcakes sprinkled with 24k gold flakes.

FAB LIFE: E! reality star Kim Kardashian, dancing to Fabolous' performance at ESPN magazine's predraft party at Espace in NYC.

IN CHARACTER: Kelly Osbourne and Debi Mazar, shooting Tarina Tarantino’s new Wizard of Oz-themed catalog at the Sparkle Factory in downtown L.A., where the two dressed as a good witch and wicked witch, respectively.

CARDED: Robbie Amell, star of Nickelodeon's True Jackson, VP, popping the champagne to toast turning 21 at Jet nightclub in Vegas with girlfriend Italia Ricci by his side.

PLAYMATES: Sheryl Crow and Marisa Tomei  sipping on Jett vodka cocktails at the opening of Kathy Najimy’s new show, Back to Bacharach and David, at the Music Box in Hollywood.

MAMA'S BOYS: Victoria Beckham with sons Brooklyn, Romeo and Cruz, at Nordstrom at the Westside Pavilion mall in L.A., where she spent around $500 on Quicksilver apparel for her boys and a pair of True Religion jeans for herself.

PLAYING IT COOL: Bradley Cooper, ignoring flirtatious women who approached him at the Grey Goose-sponsored afterparty for the Cinema Society screening of Obsessed in NYC.

Michael Becker / Fox

BRIT BASH: American Idol finalists Adam Lambert and Allison Iraheta, hitting the British Consul’s house in L.A. to celebrate the start of Brit Week.

LETTING LOOSE: Prince and Lance Bass, dancing at their VIP tables at Hollywood club Halo, where Ya Boy and Dr. Hollywood performed their hit “We Run L.A."

SWAG SESH: Hilary Duff and Natalie Portman, leaving the Tribeca Film Festival DirectTV Lounge with L'Oréal gift bags.

FUN IN THE SUN: Camila Alves, Angie Harmon and Vanessa Minnillo, shopping at the Alice + Olivia opening in Malibu, Calif., while Matthew McConaughey sipped beer outside with Jason Sehorn.

MUSCLE HEAD: Entourage's Brandon Quinn, challenging celebrity trainer Mike Ryan to a few rounds of Wii boxing at the launch of the new Gold's Gym Nintendo game in Venice Beach.

 —Additional reporting by Dahvi Shira

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