(AP Photo/Courtesy of Harpo Studios, Inc., George Burns)

It's been reported all week, but Lance Armstrong's confession to using performance-enhancing drugs became official in a taped interview with Oprah Winfrey on Thursday night.

Armstrong admitted that he used banned substances, blood doping and transfusions, testosterone, cortisone and human-growth hormones in all seven of his Tour de France titles.

The two-part series will continue Friday night on the Oprah Winfrey Network.

Here are a few highlights from Thursday's interview:

Armstrong's confession

Why admit guilt now?

Doping scheme details

Reasons for doping

Armstrong's 'inexcusable' attacks

Winning at all costs