(Cover) - EN Showbiz - Kristen Stewart was presented with a motorcycle at her 21st birthday, according to sources.

The American star who is famed for her role as Bella Swan in the hugely popular Twilight franchise celebrated her milestone birthday in Vancouver on Saturday night with the films cast and crew.

Kristen and her co-stars, including her on/off boyfriend Robert Pattinson, are currently in Canada to film the latest instalment of the Twilight saga.

The actress celebrated with a private party at Rockwell's Bar & Grill in Squamish, and was given a birthday present to remember.

"Rob was so excited for Kristen and they each took turns riding it," a source told Us magazine. "Kristen learned to ride a dirt bike in New Moon so they thought it would be appropriate. Rob was supervising as she sat on it to make sure she was OK. They looked like they were having a great time, and it will be something they can really enjoy!"

The birthday girl was presented with a simple chocolate cake at 10pm and was in good spirits at the bash, according to insiders. Kristen and the rest of the Twilight clan took the opportunity to enjoy their time together as filming is almost ready to wrap.

"Rob led the crowd singing for her, and you could tell she was so embarrassed but in a cute way! the source added. Everyone was in a good mood, but it was a bittersweet night (as filming is almost complete)."

Kristen who met Robert while shooting the first Twilight film in 2008 showed they were very much an item at the celebration. Onlookers revealed that the pair looked very much in love, showcasing their affection throughout the course of the night.

"Rob and Kristin were together all night," says the insider. "They held hands and he kissed her cheek a bunch of times." (C) Cover Media