He won ten world titles and defeated tough guys at every turn. But his biggest opponent was alcoholism. A blackout drinker for most of his life, Oscar De La Hoya confronted what he calls the 'monster' last year. He has been sober ever since.

Dr. Drew talks to the champ about why he wanted to tell the truth, how he wants to inspire others, and what's most important in life, now that drinking is not a priority. Hear his message for millions who are struggling with addiction now, and get his take on Whitney's Houston death.

Plus: Rihanna and Chris Brown are making music together. Are they a couple?  He attacked her two years ago and pleaded guilty to a felony. Can domestic abuse be treated? Should a couple who's had trouble reconcile? Is past behavior likely to be repeated? Dr. Drew and his guests answer those questions and more tonight.

Watch Dr. Drew tonight and every weeknight at 9 on HLN.

*We'll also be making reference to this link tonight: Batterer's Intervention Program (BIP)