Couples Watch: Kate Bosworth & James Rousseau, Leighton Meester & Sebastian Stan

04/27/2009 at 06:00 AM EDT

Couples Watch: Kate Bosworth & James Rousseau, Leighton Meester & Sebastian Stan
Kate Bosworth and James Rousseau
Jackson Lee/Splash News Online
• With a glass of white wine in hand, Kate Bosworth greeted guests with beau James Rousseau at a party celebrating the opening of the Chloe boutique at Los Angeles's Milk Studios. The two made a low-key couple, chatting with other guests and refraining from obvious PDA, though Bosworth occasionally would tenderly touch her boyfriend's back.

• On the other hand, an affectionate Leighton Meester held hands with her boyfriend Sebastian Stan at the Chloe party – and he kept his arm around her all night. The two danced to the music – Perry Farrell performed – and snapped pictures with their cell phones while smooching on the dancefloor.

Paris Hilton and Doug Reinhardt are still going strong: The couple stopped by Nobu West Hollywood with a pal for a late-night dinner. The heiress sported a black and white tube dress and never let go of her beau's hand the entire evening, a source says. Later in the weekend, the two were spotted at Britney Spears's concert in Las Vegas.

• It was unseasonably warm in New York – but that didn't stop Anne Hathaway and Adam Shulman from heading out in the heat. The color-coordinated duo – both in blue – took the actress's chocolate Labrador, Esmeralda, for a walk in the East Village.

Christina Applegate, rocking out at a Depeche Mode concert (for Jimmy Kimmel Live) with her own rocker beau Martyn LeNoble. The two were only some of the celebs enjoying the outdoor concert: Jared Leto watched from the VIP section, while Chris Martin brought a bunch of friends and danced at the show, which was sponsored by W Hollywood Residences.

Angie Harmon celebrated her hubby Jason Sehorn's birthday with a romantic dinner at Wolfgang Puck's Cut at the Palazzo in Las Vegas. The birthday guy – he turned 38 – was also presented with a special cake.


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