She was one of Hollywood's hottest stars. A fixture on popular 80's and 90's dramas "Dynasty" and "Melrose Place." Now, ordered into treatment. ET with the exclusive details. Plus, her "Melrose Place" co-star is revealing a shocking secret for the very first time. And, more fireworks in paradise. The brawl that sent a "Bachelor" into the arms of another reality star. Then, how a superstar singer is surprising her fans again and the major milestone for "Saved by The Bell." Entertainment Begins and Ends with ET.