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NOT that we’d ever spoil an epsiode of “Gossip Girl” for you, but . . .

When Serena (played by Blake Lively) showed in Times Square yesterday, kissing a man we’d never seen before – and the whole thing was splashed on the Jumbotron – it’s hard not to, um, gossip.

The mystery man is Aaron Rose, played by John Patrick Amedori.

He’ll be around for at least a couple of episodes, starting later this month, we’re told.

In the books the show is based on, Rose is the step-brother of Serena’s BFF, Blair Waldorf.