Which Celeb Dudes Shared a Smooch?

Two male actors pucker up at a Haiti benefit concert...can you guess who?

Same-sex kissing costars seem to be a trend this week.

Following Jim Carrey and Ewan McGregor's spit swap yesterday comes this new smooch. The guy actors have shared the silver screen before, but last night, they locked lips at a Haiti benefit concert featuring the musical stylings of Jack Black's band Tenacious D. 

The funny thing is, both boys have womanizing reputations. But one recently got engaged to a songbird. Think she'll consider this kiss cheating?

Find out who's in the same-sex smooch after the jump.

It's Jason Segel and Russell Brand, who worked together in Forgetting Sarah Marshall.

And while former bad boy Russell is engaged to Katy Perry, considering she has a hit single about kissing girls herself, we think she'll forgive him.

Plus, at least their PDA was all for a good cause!