Keira Knightley is All Growed Up

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Well, looks like Keira Knightley is a big girl now, having just celebrated her 21st birthday in style. 1920s style, that is. Keira showed up to her birthday party at Paper club in London in full flapper gear, along with new(ish) boyfriend, Rupert Friend, her co-star from Pride and Prejudice.

In fact, it looks like Keira's new love is the real thing, as the couple have reportdely moved in together, into Rupert's London bedsit (which according to my extensive Google searching is an apartment that may be smaller than a bachelor, or studio apartment), reports Life Style Extra.

A source told Britain's News of the World newspaper: "They are so in love so it only seemed natural from them to want to be with each other.

"They thought about Rupert Moving into Keira's place but it's full of memories of her ex, Jamie Dornan.

"Also, Keira feels more anonymous in the area where Rupert lives."

Keira and Rupert's romance first came to light after they were spotted frolicking on a beach during a break in the Bahamas.

An onlooker was quoted as saying: "Keira and Rupert looked very much in love. She was smiling and he couldn't keep his hands off her - she looked fantastic."

Well, good for her, I guess. But the pair best not get too cozy, because as everyone knows, if things don't work out for me and Natalie Portman, Keira Knightley is my backup.

More pictures of Keira Knightley at her 21st birthday party after the jump.