Rachel Bilson

Jeff Vespa/WireImage.com

I have to share a little news, because it made me swoon.

Rachel Bilson will be guest starring on NBC's new dramedy Chuck as a love interest for the Chuckmeister himself, Zachary Levi. I'll be telling you much more about Zachary tomorrow (when, thanks to a glee-fllled video clip, you too shall fall madly in love with him), but let me just say this show is not to be missed, and this casting news is evidence Chuck just continues on its upswing.

Sources tell me Bilson will become the third party of a love triangle with Chuck and his CIA protector on the show, Yvonne Strzechowski (how's that name for a mouthful?), who told me while I was on set that it's "only natural" her character would start to have feelings for the guy...You'll see why tomorrow!

Personally, I think the casting of Bilson is genius—she'll get O.C. fans watching and the guys panting. Also, as a former Seth Cohen lovergirl, she knows her way around those geekalicious guys like Chuck.

Anyone else excited about this casting and this show? Sound off below and let the Chuck love begin...