updated 08/14/2009 AT 1:00 PM ET
•originally published 08/17/2009 AT 6:00 AM ET
Mary-Kate Olsen and boyfriend Nate Lowman were glued at the hip at New York’s Jane Hotel, where they partied well into the morning with a crowd that included Mischa Barton. The two rarely left each other’s side as they danced with their friends at the West Village hot spot. They also engaged in some PDA, making out and laughing with each other all night.
Ashley Tisdale and boyfriend Scott Speer, celebrating after her outdoor concert at The Americana at Brand shopping mall in Glendale, Calif., with a late-night dinner on the second floor of Katsuya Glendale. The singer was joined by her band in the private dining room. Meanwhile, Jennie Garth and her kids ate outside at the restaurant so they could see and hear Tisdale’s concert clearly.
Reese Witherspoon, cheering from the sidelines as beau Jake Gyllenhaal played basketball during a weekend getaway in Martha’s Vineyard, Mass. The actor was participating in a charity match outdoors at the Chilmark Community Center, where he played on a five-person team. Earlier in the weekend, Gyllenhaal ran in a 5K race along with Witherspoon’s kids, Ava, 9, and Deacon, 5, who took a fun, leisurely approach to the run while he speedily completed it in under 21 minutes!
Lauren "Lo" Bosworth, cuddling in the candlelight with boyfriend Scott Hochstadt at a K-Swiss-sponsored dinner at West Hollywood’s Chateau Marmont. “They arrived hand-in-hand and they were giggling and snapping pictures of themselves with their camera phone at the table,” says an eyewitness. “He was always by her side – full-on doting.”
Also at the Chateau on a separate night: Rachel Zoe and husband Rodger Berman, dining with a male pal on the back patio. The stylist and reality star, who sipped tea and picked at her salad, scrolled through her BlackBerry at the table and occasionally inserted herself into the quiet conversation. Toward the end of the dinner, Zoe put down her phone and seemed more happy to engage with her tablemates. Berman even put his hand on top of hers and kept it there for the rest of the meal.
By DAVID CAPLAN, JENNIFER GARCIA, CARLOS GREER, LIZ MCNEIL and JUDY RAKOWSKY