Kate Bosworth and James Rousseau
Jackson Lee/Splash News Online
04/24/2009 at 02:00 PM EDT
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.
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.
, 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.
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.
By SHRUTI DHALWALA, MARK GRAY, JESSICA HERNDON, EUNICE OH and CHRISTINA YOONFriday's Caught in the Act >