It sounds like Kristen Stewart had a very good 21st birthday party! The Twilight beauty reportedly partied late Saturday night at the wrap party for Breaking Dawn with Robert Pattinson, Taylor Lautner and his rumored girlfriend/co-star Lily Collins!

PopSugar has photos of Rob and Kristen sharing cigarettes outside the Breaking Dawn wrap party and reports that Taylor and Lily were also there!

The group reportedly took turns riding Taylor’s motorcycle and Rob even shared a quick kiss with birthday girl K-Stew, too!

According to Celebuzz, Rob and Kristen were reportedly not in attendance for the wrap Kristen Stewart Birthday parti at Rockwell’s Bar and Grill in Squamish BC, but did party with the cast and crew on site.

“Rob and Kristen are affectionate, it’s not like they try to hide their relationship anymore from their friends,” the source explains. “They just aren’t obnoxious about it and don’t need to do it for the press.”(okmagazine)

The photos are a bit blurry, but Celebuzz’s source says Rob and Kristen’s PDA isn’t surprising.

See exclusive photos of Kristen Stewart‘s birthday here