Her claim to fame was playing Brenda Walsh, the wildchild and queen B of Beverly Hills: 90210 (the character that Alex Wang also named his Brenda bag after!) and subsequently becoming one of Hollywood's most notorious bad girls. But before all of that, she charmed us as the happy-go-lucky Jenny Wilder on Little House on the Prairie, shop-o-haulic Rene Mosier in Mallrats, and of course, as mean girl Heather Duke in Heathers. Later on, she would acquire telekinetic powers as the wickedly pretty Prue Halliwell on Charmed, but deep down, we'll always remember her as Brenda. Happy birthday, Shannen! Our gifts, as always, below.