Check out the first 90210 promo on YouTube that contains both Kelly (Jennie Garth) and Brenda (Shannon Doherty).
Blink and you miss Shannon Doherty who appears around the :20 second mark when the announcer references "old friends". But didn't Kelly steal Dylan from Brenda, you ask? All in the past, my friends...
Also, don't forget to enter SideReel's Beverly Hills 90210 Giveaway, where you can win the first 5 seasons of the original series on DVD!