When singer Chris Brown was arrested in 2009 for assaulting his then-girlfriend, pop superstar Rihanna, people around the world expressed their outrage. Now, Rihanna tells Oprah how it affected her personally.

He may be best known as Frasier, but Emmy award-winning actor Kelsey Grammer now stars in a political drama, Boss, which Oprah says is her new favorite TV show. Watch as Kelsey explains how playing Tom Kane, the mayor of Chicago, is therapeutic.

Olympic gymnast Gabrielle 'Gabby' Douglas won gold and the hearts of millions. Now, Oprah travels to West Des Moines, Iowa, to sit down with this 16-year-old gold medalist. Plus, Oprah meets Gabrielle's mother, Natalie; her three siblings; her coach, Liang Chow; and visits with her host family.

Famed Olympian Mark Spitz says that when he was 9 years old, his mother enrolled him in a YMCA summer camp. Watch as Mark tells Oprah how an aversion to arts and crafts led him to the club's heated pool and his very first swim team.

Husband-and-wife team Bart Conner and Nadia Comaneci, both gold medal gymnasts, also share a commitment to the Special Olympics. Watch as Bart reveals how the Special Olympics transforms lives around the world.

Shawn Johnson tells Oprah how she relied on her faith during her gymnastics career and why spirituality gave her something greater to work for.

Track-and-field superstar Carl Lewis says that at age 29, he overhauled his eating habits and began following a vegetarian, sometimes vegan, diet. Then, at age 30, he ran his personal best. What does he do today to stay slim? Find out now.

In 2008, powerhouse gymnast Shawn Johnson took home four medals from the Olympic Games, including one gold and three silver. But, even on her best days, Shawn says, she struggled with the constant pressure to be thinner. Watch as this 20-year-old opens up about her body image issues.

Track-and-field star Carl Lewis, one of the most decorated Olympians in history, won nine gold medals and one silver medal during his career. However, Carl's achievements were often overshadowed by his reputation as arrogant.

For 36 years, Mark Spitz, a swimmer who won seven gold medals in 1972, held the record for the most gold medals in a single Olympic Games. Then, in 2008, Michael Phelps broke his record. Would Mark ever swim against Michael? Find out now.