With Robert Pattinson leading the Happy Birthday serenade for Kristen's 21st Birthday, and a lot of her cast and friends like Taylor Lautner, She had a wonderful birthday. They chilled at Rockwell's Bar & Grill in Squamish, British Columbia on Saturday night. The party-goers dined on treats like oysters, and at around 10 p.m., the birthday gal was presented with a "simple chocolate cake." KStew and RPattz have always kept their relationship on the DL, but they seemed to be getting a bit of PDA on at the low-key bash. So what did the actress get for her birthday? Rob and the gang all pitched in to buy her a motorcycle! "Rob was so excited for Kristen and they each took turns riding it," the source said. "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!"So adorable I love it.. thank you to MTV for this information.