It’s prom night, and the powers that be have come down particularly hard on the concept of an after-prom party, with all the underage drinking that would inevitably take place. The West Coast is apparently a lot stricter in at least attempting to enforce this than is the East Coast, where the cast of Gossip Girl not only engage in underage drinking, but do so with the blessing of bartenders and consenting adults. This doesn’t stop the kids of the 90210 from trying to plan one, however, and when the original party gets outed before it can even begin — with everyone laying the blame at the feet of poor Annie Wilson (Shenae Grimes) — Naomi (AnnaLyne McCord) comes to the rescue by offering to have the party at her place. Of course, when snooty sister Jen (Sara Foster) disagrees, Naomi is quick to put her in her place, seeing as how Naomi is the only one paying the rent. Bad move, Naomi — particularly since you just overshared Liam’s confidential information. I wonder what Jen will do with those little kernels of forbidden knowledge to get back at you?

Naomi doesn’t get to attend her own after-prom, however, because — surprise! — Adrianna (Jessica Lowndes) has gone into labor, three weeks early! Naomi joins Navid (Michael Steger) and the Wilson parental units, Harry and Debbie (Rob Estes, Lori Loughlin) at the hospital to await the blessed and tearful event, and it’s here that Harry and Debbie learn that something just wasn’t quite right with the food at the official school-sponsored after-prom party, and it enables Debbie to accidentally glom onto a secret desire harbored by their friend Kelly (Jennie Garth). The maternity ward also serves as the platform for the return of Brenda (Shannen Doherty), freshly back from China — and what she was doing there ties in nicely to Adrianna’s current situation and decisions.

Of course, all the major action is going on back at Naomi’s house, where Annie tries desperately to hold things together for Naomi. But that doesn’t stop Dixon (Tristan Wilds) from confronting his friend, Ethan (Dustin Milligan), over Dixon’s relationship with the ever-volatile Erin Silver (Jessica Stroup). And when Jen spies Liam (Matt Lanter) among the attendees, she sees a situation rife with all kinds of vicious opportunities.

This season finale leaves us with a ton of cliffhangers. You won’t believe what Naomi says to Annie. You’ll be shocked by who Annie calls. And just exactly who did Annie run into after leaving Naomi’s party? And Liam finds that his stepfather will go to extreme lengths to “take care” of his new stepson.

There’s a new zip in the old zipcode, and it looks to be a long, anxious summer.

90210, “One Party Can Ruin Your Whole Summer” airs Tuesday, May 19, at 9pm ET / 8pm CT on the CW Network.

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