90210 celebrated Halloween this week, as the most recent episode of this CW hit unmasked a number of truths about various characters.

Next Tuesday, meanwhile, the group will have another reason to celebrate: Someone is getting married! Who will it be? This photo reveals all. And what Jersey Shore cast member will stop by during the gang's trip to Las Vegas? The following promo reveals that answer.

Watch now.

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