Is Naomi pregnant? Why is she half-naked? And posing for a mug shot? And what does Pledge Week entail? And who might be proposing to whom?!?

All of these questions/topics are addressed in the following 90210 promo for season four, which reveals the first footage from new episodes. Check it out now:

The series returns on Tuesday, September 13, with guest stars including: Kellie Pickler, Brandy Norwood, Sarah Hagan, Justin Deeley and Megalyn Echikunwoke.

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