Gossip Girl star Leighton Meester and boyfriend / co-star Sebastian Stan are said to be engaged, according to a report in the New York Post this afternoon.

A source close to the actress said that Leighton and Sebastian made the announcement on their "secret" Facebook pages. This has not been confirmed.

Meester and Stan have been dating since they met on the set of Gossip Girl last year. Sebastian plays recurring character Carter Baizen on the series.

A rep for Leighton Meester had "no comment" on the engagement rumors.

Are Leighton Meester and Sebastian Stan engaged?

No one in her camp has issued any statement on the Leighton Meester sex tape - allegedly made when she was 18, a few years ago - to this point, either.

We'll see if this engagement rumor turns out to be true, although we do have our doubts, as similar stories have been reported multiple times before.

If it's true, though, congrats to Leighton and Sebastian!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.