Oprah sits down with some of Hollywood's most powerful African-American actresses, including Alfre Woodard, Viola Davis, Phylicia Rashad and Gabrielle Union. Tune in Sunday at 9/8c.

• Watch a sneak preview
• How Gabrielle Union inspired Oprah
  

Oprah sits down with John Legend to talk about his first solo album in five years. Plus, John's fiancée, Chrissy Teigen, opens up about their relationship and rumors of infidelity.

• John's favorite reading space
  
• The unseen side of Kanye West
• Why John decided to propose
  

Oprah visits the set of the hit TV singing competition The Voice and speaks with all four coaches: Usher, Shakira, Blake Shelton and Adam Levine.

• Shakira's motherhood confession
• Adam Levine's tattoos explained
• Usher takes Oprah on a set tour