Chuck Bass goes gay - but is it a one-off?Gossip Girl's sexiest relationship is set to get more complicated as Ed Westwick's Chuck Bass gets it on with a guy.

But never fear Chair / Bluck fans - it's girlfriend Blair who's behind the affair.

Actress Leighton Meester revealed: "It's not tied into a threesome. I sort of make the kiss happen. I can tell you that much, and that's it.

"I think all of this is just to grab everybody's attention," added Leighton. "We're all in college now, so we can definitely push the limit with the sexuality, which is fine by me."

The lucky guy who gets to lock lips with Ed is newcomer Neal Bledsoe (CSI: NY), who guest stars as Josh Ellis, head of freshman affairs at NYU.

It seems that Blair's so desperate to deliver the freshman speech, she pimps out her millionaire boyfriend to the man in charge in order to snag the coveted slot.

Talk about going beyond the call of duty.

But Blair's dastardly plan might be about to backfire. In the original book series by Cecily von Ziegesar, Chuck swings both ways.

Could a saucy same sex snog change Chuck Bass' life forever?

Find out when Gossip Girl is on TV.