Guess the secret of Seattle Grace's possible lesbians is out.

In the hilarious Grey's Anatomy clip below, Mark Sloan (Eric Dane) happens to walk in on a conversation between Callie (Sara Ramirez) and Erica (Brooke Smith) - and he just can't resist a couple of classic Sloan wisecracks:

Awesome. Follow the link for more Grey's Anatomy videos and spoilers from this Thursday's all-new episode, entitled "Here Comes the Flood" ...

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