The baby girl is due April 3, and she will be the couple's second daughter.
"I am Estrogen Man," Lawrence told the magazine. "I'm from a family of all boys, and when I told my best friend Dave that my wife and I were having a second girl, he said, 'Look at you, my best buddy Estrogen Man!'"
The Dancing with the Stars alum said his new daughter will be named Liberty Grace. The first name "is something I've always loved," Lawrence said, and Grace honors Lawrence's grandmother, who died earlier this year.
The couple married in July 2005. Their other daughter, Charleston, is 3 years old.
What do you think of the new baby's name?