'Gossip Girl' guest Hilary Duff caught kissing Blake Lively's boyfriend

Yes, yes, the kiss (pictured below) is for an upcoming "Gossip Girl" scene, but Hilary Duff is still making out with Blake Lively's boyfriend, Penn Badgley.

This season, Duff will join the series as Olivia, a former child star who's looking to live the normal college freshman experience at NYU. She ends up rooming with Vanessa (Jessica Szohr) and -- as you can see -- get cozy with Dan (Badgley).

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Any thoughts?

Cute couple?

Just happy to see Humphrey untangled from Georgina (Michelle Trachtenberg)?

And how do you think Duff will fit in with the "Gossip" crew?



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