Blake Lively Birthday Gossip Girl  Cast

Life & Style

Blake Lively just turned 21, but she still seems stuck in the '20s.

The Gossip Girl starlet and all her castmates celebrated with a 1920s-themed bash at the Palace Hotel, natch. The birthday girl planned the entire soiree herself.

"I love to plan parties," Blake told Life & Style. "That would be my career if I wasn't an actress."

Soulful singer Michael Bublé serenaded her with a special version of "Happy Birthday to You," while guests downed peach mimosas.

Lively, who doesn't like to drink, toasted with Coca-Cola, instead of the other bubbly beverage.

And any news about Penn Badgley, with whom she's linked both on and off camera?

"They were very cozy," according to an onlooker.

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