It's a very Bella birthday!

A very Bella Birthday. Twilight cast and crew helped Kristen Stewart celebrate the big 21 in Vancouver Saturday night with a private party Squamish.
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Guests, including beau Robert Pattinson, snacked on oysters and passed foods, an insider tells reveals. And just around 10 pm, the birthday girl was presented with a "simple chocolate cake" by a private catering company.



"Rob led the crowd singing for her, and you could tell she was so embarrassed but in a cute way!" says the source. "Everyone was in a good mood, but it was a bittersweet night (as filming is almost complete)."
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While the franchise might be wrapping up, Stewart and Pattinson's relationship showed no signs of slowing down.

"Rob and Kristen were together all night," says the insider. "They held hands and he kissed her cheek a bunch of times."
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And it seems the actress will definitely have something to remember the night by, a second insider adds that everyone pitched in and got her a motorcycle.