Couples Flock to New Moon After Party By Lisa Ingrassia, people.com

New Moon may be about a love triangle, but it was couples night at the party after the film's Los Angeles premiere Monday night.

Following the screening of Twilight's much-anticipated sequel, costars and fans headed to L.A.'s Hammer Museum.

Jennifer Love Hewitt and boyfriend Jamie Kennedy attended the party, which had an Italian theme as a nod to the New Moon Volturi scenes set in Volterra, Italy. "They were holding hands and walking around, they kept to themselves for the most part," says a fellow partygoer. "They looked like they were having a good time."

Another set of costars who seemed happy to be hanging out? Glee cast members Lea Michele and Mark Salling. "They were whispering, giggling, and talking closely to each other," says the source. "They looked like they were flirting!" (For the record, Michele's rep says the costars are not a couple.)

Partygoers ate Italian food and CRUMBS Bake Shop Twilight-themed cupcakes served by caterers wearing red cloaks, and the outside patio was decorated with extra foliage and red lanterns hanging from trees to mimic the Forks forests, where the film is set.

Keeping Their Distance

More low-key costars were Kristen Stewart and Robert Pattinson, who were spotted holding hands last week. But after a night of dodging questions about the status of their relationship on the red carpet, the costars, along with Taylor Lautner, "headed straight for the VIP area," says a source. According to another guest, Stewart and Pattinson, "didn't hang out at the party."

Later, most of the New Moon cast members headed to the rooftop at the Thompson Beverly Hills where they let loose in a more intimate setting with their close friends and families. "They all stayed hanging out until past 3 a.m.," says another source.