Federline, a 36-year-old backup dancer and "Celebrity Fit Club" alum, announced the happy news via Instagram Sunday. Sharing a picture of a floral arrangement in a tiny wagon, the new dad wrote, "Words cannot express the joy my children bring me. We are very excited to welcome the newest member of our family.. I love you with all my heart. @crownv_16 #thefedz #sixthman I mean #sixthwoman."
They have not shared other birth details, including their daughter's name, weight and measurement.
Federline surprised Prince with a proposal during a trip to Las Vegas. He got down on one knee and asked, "Victoria Prince, will you marry me in two days, in front of 30 of our closest family and friends?"
This is the second child for the couple, who wed in August 2013, and the sixth child for Federline. In addition to raising daughter Jordan Kay with Prince, a former volleyball player, the "PopoZo" rapper shares custody of sons Sean Preston and Jayden James with his ex-wife, singer Britney Spears. Federline is also father to Kori Madison and Kaleb Michael with ex-girlfriend, actress Shar Jackson.