Last week, Oprah.

This week, Jennifer Aniston.

As if 30 Rock wasn't hilarious on its own, the sitcom has lined up an abundance of tremendous co-stars. On Thursday night, Aniston appears as Liz Lemon's former roommate...

... and she has her sights set on Jack!

[video url="/videos/jennifer-aniston-on-30-rock/" title="Jennifer Aniston on 30 Rock"][/video]

[video url="/videos/30-rock-clip/" title="30 Rock Clip"][/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.