ET's countdown to the premiere of The CW's new "90210" spin-off wraps up with Dylan (Luke Perry) and Brenda's (Shannen Doherty) love story from the original "Beverly Hills, 90210."

Following the senior class of '93's prom, Dylan whisks Brenda away to a suite in a posh Beverly Hills hotel, where he sweeps her off her feet and the couple makes love for the very first time. Brenda tells him how lucky she feels, as she asks, "How many girls get to have sex for the first time with someone they love?"

At midnight tonight, SOAPnet will celebrate the original Aaron Spelling show with a 24-hour marathon. Then, on Tuesday, Sept. 2 at 8 p.m., the all-new "90210," starring Rob Estes, Lori Loughlin, Shenae Grimes, Tristan Wilds and Jennie Garth will premiere with a special two-hour episode on The CW when the Wilson family moves to Beverly Hills.