Regardless of what's going on in Kristen Stewart's crazy love life with Robert Pattinson, she still has her other Twilight co-star and pal Taylor Lautner as a friend in her life, even though the saga is over.

In fact, Kristen and Taylor are still so close that she was a guest at his low-key and intimate 21st birthday party at Lucky Strike in Hollywood over the weekend!

Although Kristen showed up a bit late to the party, "She was being fun and social, bowling and high-fiving," a source tells Us Weekly. "She and Taylor definitely seemed to be good friends and she was living it up."

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Unfortunately, Taylor couldn't "live it up" quite yet, as his actual birthday fell on Monday. He didn't drink or get too rowdy during the party, which Ashley Benson and Patrick Schwarzenegger also attended. Rob wasn't there for the fun, although it was likely just because he's filming a movie in Australia right now.

"When Kristen arrived, [Taylor] got super excited and gave her a big hug," another insider tells E! "It was more of a best friend moment." Awww.

Do you think Taylor would be Team Rob or Team Kristen if his pals ever split up?

Photos Courtesy of: Fame/Flynet