It’s National Adoption Month, which means that adults are getting more encouragement than usual to adopt a child. In the U.S. alone, there are nearly half a million children in the foster care system, and many of them are looking for a home.
Many celebrities, including Angelina Jolie and Brad Pitt, have heeded the call.

Angelina Jolie and Brad Pitt
The Hollywood superstars have six children, three of whom are adopted: Shiloh, Maddox and Pax. Are they planning on adding to their brood? The kids (see photos) get to see a lot of the world because their parents are often on set in far-flung locations – Jolie is now directing her first movie in an unlikely place.

Tom Cruise and Nicole Kidman
When Cruise and Kidman were married – and it was a long marriage by Hollywood standards – they adopted Connor and Isabella. (See photos). But their parents split and formed new families, and the kids have a say in where they spend their time. Kidman’s comment.

Rosie O’Donnell
O’Donnell, who was known as the “Queen of Nice” for her daytime TV show, is passionate about adoption, and she has adopted three children: Parker, Chelsea and Blake. (See photos) O’Donnell, who announced that she is gay not long before she quit her show, also was married.

Sheryl Crow
Singer Sheryl Crow is adding another member to her family with the recent announcement of the adoption of her second son, Levi. The Grammy-winning star told fans that Levi James was born on April 30. Crow adopted her first son, Wyatt, in 2007 when he was just two weeks old

Elton John
Elton John fell in love with baby Lev, a child in an HIV-positive orphanage in Ukraine. Although his hopes for adoption were dashed, he's not giving up.

Father George Clements
Father George Clements received widespread attention when he became the first Roman Catholic priest to adopt a child. (How many did he ultimately adopt?) Father Clements went on to found an adoption program that currently operates in 32 states.

George Lucas
"Star Wars" creator George Lucas adopted his first child when he was married and adopted two more children as a single dad. Lucas is the founder of an educational foundation, which focuses on project-based learning as well as helping special needs children.

Joan Crawford
The eldest adopted daughter of Joan Crawford wrote a book about Crawford's parenting skills. Crawford adopted a total of four children. The agency handling her first adoption was later tied to a black market baby ring.

Madonna
Superstar Madonna adopted Malawian-born David Banda in 2006. In 2009, Madonna petitioned to adopt a second child from Malawi. Over the protests of the child's father, she was initially refused, but Madonna won on appeal and Mercy James joined the family in the spring of 2009.

Ben Stein
Through admitted selfishness on his part, Ben Stein never considered becoming a father. After adopting his only child, he wrote a book about fatherhood.

Lionel Richie
Three-year-old Nicole Richie moved in with Lionel Richie and his former wife when Nicole's biological father hit hard times. Richie officially adopted Nicole six years later.

Katherine Heigl
Katherine Heigl and her husband, Josh Kelley, adopted their first child, a baby with special needs from South Korea (photos). The former "Grey's Anatomy" star says she was inspired by her sister. Heigl says her own reaction to motherhood was stronger than anticipated.

Alex Kingston
Best known for her role as Dr. Elizabeth Corday on the hit show "ER," Alex Kingston experienced two failed adoptions. Does Kingston want to try the adoption route again?

Jamie Lee Curtis
Jamie Lee Curtis and husband Christopher Guest adopted two children, son Tom and daughter Annie. Curtis, an accomplished actor and children's book author, wrote a book about adoption from a child's point of view.

Sandra Bullock
Oscar winner Sandra Bullock brought home Louis Bardo in January and kept the adoption a secret. Ten days after the Oscars, Bullock and husband Jesse James separated (when did they divorce?).