Take a look at the first official trailer for Season 4 of 90210, which premieres Tuesday, Sept. 13 at 8 p.m. on the CW. Check out the trailer below!

In the new season, Naomi (AnnaLynne McCord) starts off her college life in a big way - and apparent arrest. Liam looks ready to start the academic year as a married man, and Navid (Michael Steger) and Silver (Jessica Stroup) look positively glowing, at least until his kid sister (Fabiana Udenio) enters the picture.

Naomi and Justin Deeley's Austin -- the new cowboy in town - get flirty.