Spotted: Eleanor Waldorf running into Serena Van Der Woodsen on the Upper East Side.

Margaret Colin , who played Blair Waldorf's mom on Gossip Girl , revealed that she recently had a "really wild" reunion with her former costar Blake Lively —and the meet-up was entirely by chance.

"I ran into Blake on the street, which was hysterical because she’s such a big star now," the 67-year-old told Us Weekly in an interview published Nov. 18. "It was a big bear hug on the streets of New York, and she was just having lunch in a cafe."

To make it even more surprising, Margaret had only been back in the Big Apple for a little awhile at the time.

"That was a couple of months ago after I came back from shooting in Vancouver,” she said. “What are the odds?”

And Margaret provided insig

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