Hollywood's Secret Adoptions

Lionel Richie and his then-wife Brenda Harvey began caring for Nicole when she was two and legally adopted her when she was nine.

McGregor and his wife Eve Mavrakis adopted a four-year-old girl from Mongolia in 2006. The toddler joined the couple's two biological daughters Clara and Esther.

Charlie Sheen's ex adopted daughter number three last summer, naming her Eloise Joni after her late mother who passed away due to cancer in 2007.

Bullock went through a four-year adoption process before bringing home baby Louis in 2010. "It takes good people with integrity," Bullock said when asked how she kept her adoption process out of the headlines. "Human beings exist that have integrity and that know how to keep their mouth shut."

Unbeknownst to the world, Charlize Theron went through an arduous adoption process that reportedly completed on March 15. Even tougher than the actual act of adopting may have been keeping the task under wraps. In an interview with ET over the weekend, the actress credited her "good friends" for keeping a lid on the baby news. Click through to see a few more stars that run with a trustworthy circle who can clearly keep a secret.