By People Staff
December 25, 2006 06:00 AM

Christina Aguilera, celebrating her 26th birthday with husband Jordan Bratman and 18 of her closest friends at L.A.’s Hyde Lounge. Amid smooches with her man, the singer opened presents from Fred Segal Beauty, Taschen and Jimmy Choo. “She was having such a blast,” says an onlooker. Aguilera also sipped on Veuve Clicquot Ponsardin and rocked out to Beyoncé’s “Crazy in Love.”

Nicole Richie and Joel Madden, holding hands as they shopped at L.A. store Fred Segal. Later, the pair feasted on soft-shell crab rolls and tomato ceviche with rock shrimp at Beverly Hills eatery Matsuhisa. “They were really affectionate,” says an onlooker.

Chris Rock and wife Malaak Compton-Rock, shopping at L.A. mall The Grove with daughters Lola and Zahra. “They took a ride on the trolley,” says an onlooker.

Heather Graham, admitting that she is dating club owner Charles Ferri at a Cinema Society screening of Children of Men at New York City’s SoHo Grand hotel. “He’s so cute,” she gushed to us. “It was a few months ago, and I remember our first date, but I shouldn’t talk about it …” Ferri added: “Our first real date was in September, we went out in New York. I took her to a restaurant in my area in Hell’s Kitchen, an intimate dinner there.”

Ellen Pompeo and fiancé Chris Ivery, shopping at Culver City, Calif., gourmet specialty store Surfas. “They bought jars of saffron,” says an onlooker.

The Class star Jason Ritter, raving about a movie he’s working on with actress girlfriend Marianna Palka. “It’s called Good Dick – it started off as a dream of ours,” he told us at the Creative Coalition’s 2006 Spotlight Awards and Christopher Reeve First Amendment Awards Gala, presented by Gotham magazine at New York City club Duvet. The pair play love interests who’ve just met in the movie. “That was a little strange – but the pretending to fall in love part was easy.”

The couple in Paris in October

Jessica Alba and Cash Warren, “kissing and cuddling” over dinner at Beverly Hills eatery Mr. Chow. On another night at the restaurant, an affectionate NIcollette Sheridan and Michael Bolton had their own share of PDA.

Leonardo DiCaprio and model girlfriend Bar Refaeli, getting a tour of the 5,000-sq.-ft. San Francisco club Vessel, along with Salma Hayek, Orlando Bloom, Kevin Connelly, Gael Garcia Bernal and Lukas Haas. The celeb crew hung out there after a Global Green event and stayed until the wee hours listening to music and talking about the environment.