More on Kristen's Birthday Night with Robert

Marieclaire: Twilight beauty Kristen Stewart welcomed in her 21st birthday over the weekend, celebrating in style, with a little help from beau Robert Pattinson and a few rather famous Twilight friends.

The private party took place on Saturday, at Rockwell's Bar & Grill in Squamish, Vancouver, close to the Breaking Dawn set.

Guests – including R-Patz, and a host of other Twilight cast and crew – celebrated with the actress late into the evening, feasting on oysters and sweet treats.

And it seems thebirthday girl was intent on having a good time.

Kristen was spied laughing and chatting with friends during the evening, but reportedly stayed glued to Rob’s side for much of the night.

'Everyone was in a good mood, but it was a bittersweet night (as filming is almost complete),' one onlooker told American magazine Us.

‘Rob and Kristen were together all night,’ the insider added. ‘They held hands and he kissed her cheek a bunch of times.’

Doting on Kristen during the evening, Rob even surprised her with a birthday cake, leading the crowd in a singsong.

'Rob led the crowd singing for her, and you could tell she was so embarrassed but in a cute way!' the source revealed.

And after the cake? No 21st birthday would be complete without a show-stopping present.

Rumour has it, Rob and the rest of the Twilight cast clubbed together, surprising Ms Stewart with a sparkling new motor bike.

‘Rob was so excited for Kristen and they each took turns riding it,’ said the source.

‘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!’