Below is a funny sneak peak at tomorrow's show, Episode Seven of Season Four of Grey's Anatomy, entitled "Physical Attraction, Chemical Reaction." Meredith and Alex discuss his hooking up with Lexie, while George and Izzie confide in Mer about their sexual problems with the other. Mer's facial expressions are priceless...

[youtube]http://www.youtube.com/watch?v=Vc3R9z1tchM[/youtube]

Follow the jump for another video clip from Thursday's new episode, in which Cristina lectures intern Lexie about not talking to her about her personal life, right as a baby and her mother both arrive, in need of urgent care...

[youtube]http://www.youtube.com/watch?v=Df61Vq2woXA[/youtube]

Looks like a good one tomorrow. If you're interested, you can always see more Grey's Anatomy clips, promos and fan videos in our video section. If you are so inclined, use our Contact Us form to suggest one that we don't have!

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