Though it's clear both stars will be leaving the show, what isn't crystal clear is why. RadarOnline.com talked with opposing sources, one who said the departure is on "good terms," while the other divulged Rob is leaving because of salary disputes. The actor released his own, not-terribly-revealing statement yesterday saying, "This is my final season on '90210' and I wish the show, cast and crew nothing but the best. I am looking forward to spending time with my kids and exploring other opportunities."

For her part, Jennie's manager told Radar, "Jennie never had a contract on the show. It was never our intention for her to go on as a series regular, nor was it theirs. She was just doing the show episode by episode." E! Online is reporting that producers wanted to get rid of older characters "to establish a separate identity for the new show."

Whatever prompted Rob and Jennie to abandon ship, we're wondering what this means for Lori Loughlin's character Debbie Wilson. Will she be departing the show as well, or will she now be a single mother to daughter Annie (Shenae Grimes) and Dixon (Tristan Wilds)? Cindy and Jim Walsh played such an integral role on the original "Beverly Hills, 90210" it's hard to imagine the zip code without a single parental unit.

What do you think about Rob Estes and Jennie Garth leaving "90210"?