11/10/2008 05:12 am ET Updated May 25, 2011

Oprah! Aniston! Martin! "30 Rock" Sneak Peek Packs In The Celebs (VIDEO)

NBC rolled out the latest "30 Rock" ads this week and fans can expect a star-studded third season. Among the big names making cameo appearances are Steve Martin, Megan Mullally, Jennifer Aniston, and Oprah Winfrey. Check out the sneak peek below.