Ryan Reynolds Parties With Sandra Bullock, Blake Lively in NYC

 John Shearer/Getty; Jon Kopaloff/FilmMagic; Jon Kopaloff/FilmMagic

A blonde and a brunette on each arm for Ryan Reynolds!

The hunk turned 35 on Sunday, and was clearly in a celebratory mood three days earlier in NYC, where he dined and then hit a hotspot with not one but two beautiful, high-profile hotties: new love Blake Lively and BFF Sandra Bullock!

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First up on Thursdays, Reynolds, Lively, 24, Bullock, 47 and about seven other pals indulged in plenty of food and drink at Carriage House House at Palma Restaurant in Manhattan's West Village.

As Reynolds' close pal and Proposal costar Bullock looked on and helped the group raise a few toasts, Reynolds and Lively stayed close and nuzzled throughout the dinner, an observer told Us. "People were having a good time!" the witness said.

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Next up, the festive crew hit the Lower East Side for more drinks and a wild show at hotspot The Box.

"Blake and Ryan sort of broke off on their own after a while," a witness explained. "They were both laughing and having fun. They looked relaxed and comfortable."

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What about single mom Bullock? "Sandra also seemed to be having fun, but she was giving them their space," the observer says. "She stayed with a few of the other friends most of the night and didn't talk to Blake or Ryan as much. She was talking to the larger group and leaving Blake and Ryan alone."

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Since Lively's late September split with Leonardo DiCaprio, she and Scarlett Johansson's ex-husband Reynolds have been "seeing each other casually," a confidante explained to Us; she was spotted leaving his Boston apartment over the weekend. "Now they're both single and trying it out."

And so far, things seem to be going well! Adds the witness at The Box: "They were totally in their own little world…It was flirty."

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