Oprah Winfrey has struggled to keep viewers since moving to OWN: Oprah Winfrey Network, but she's still the first choice when the top celebs want to open up about the tough truths that can threaten to kill a career. She described her Jan. 17 interview with Lance Armstrong -- spoiler: He confesses to doping! -- as the "biggest" of her career. That's saying something. Here, a look back at the most recent Oprah-facilitated confessions:

Photograph by Michael Conroy/AP Photo

Oprah Winfrey has struggled to keep viewers since moving to OWN: Oprah Winfrey Network, but she's still the first choice when the top celebs want to open up about the tough truths that can threaten to kill a career. She described her Jan. 17 interview with Lance Armstrong -- spoiler: He confesses to doping! -- as the "biggest" of her career. That's saying something. Here, a look back at the most recent Oprah-facilitated confessions:

Photograph by Michael Conroy/AP Photo

To Find Forgiveness, Start With Oprah

Coming to Oprah
Coming to Oprah

Oprah Winfrey has struggled to keep viewers since moving to OWN: Oprah Winfrey Network, but she's still the first choice when the top celebs want to open up about the tough truths that can threaten to kill a career. She described her Jan. 17 interview with Lance Armstrong -- spoiler: He confesses to doping! -- as the "biggest" of her career. That's saying something. Here, a look back at the most recent Oprah-facilitated confessions:

Photograph by Michael Conroy/AP Photo
Steven Tyler
Steven Tyler

Oprah kicked off her new series with a two-part interview with the Aerosmith frontman, whose real name is Steven Victor Tallarico. Between talking about his eight stints in rehab and daughter Liv learning he was her dad at the age of 8, he dished dirt about being a judge on American Idol.

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Whitney Houston's family
Whitney Houston's family

The hit of the first season, this episode drew 3.5 million viewers. The late singer's daughter, ex-husband, brother, and sister-in-law shared their grief, anger, and favorite memories. Brother Gary even sang the hit, “I Look To You.” Only mother Cissy was not ready to appear. She'll sit with Oprah this season.

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The Kardashians
The Kardashians

Another two-part special, where Kim insists that her budding relationship with singer Kanye West is "no publicity stunt." Seven months later, she's pregnant.

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Rihanna
Rihanna

A tearful Rihanna talked about the abusive relationship with singer Chris Brown. In an early signal of their reconciliation, she told Oprah she forgave him.

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David Copperfield
David Copperfield

The magician, who was falsely accused of imprisoning and sexually assaulting a woman in his Barbados home, talked about his own abusive childhood and the stigma of a two-year investigation.

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David Letterman
David Letterman

"No question is off-limits in this rare interview," according to a promotional blurb. And what did that mean? Talk about the string of affairs that rocked his marriage, of course, not to mention how he feels about rivals

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Fergie
Fergie

The Black Eyed Peas star has plenty of fodder to share, including her crystal meth addiction and the tabloid chronicles of husband Josh Duhamel's infidelity. Luckily, Fergie found, they came through it stronger.

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Jennifer Hudson
Jennifer Hudson

When former brother-in-law William Balfour killed Hudson's mother, brother and young nephew, the tragedy made global headlines. The revelation here? She's forgiven him. The singer also bonded with Winfrey over their shared weight struggles, too.

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Lance Armstrong
Lance Armstrong

So what can we expect from a man who has angrily denied charges of doping for years at a time? A choked-up apology, to be sure, and an emotional plea that viewers continue to support the worthy objectives of his charity. Whether the revelations lift that lifetime ban on sports or leads to further litigation remains to be seen. But millions of viewers will likely tune in to see if he comes clean.

Photograph by George Burns/Oprah Winfrey Network via Getty Images