Kevin Federline Becomes an Uncle

Sean Preston and Jayden James have a new playmate.

Kevin Federline's younger brother Cameron has welcomed a baby girl, has learned. Cameron, 23, and his wife greeted their newborn about a week ago. She was born with an upper respiratory illness, but "she is OK now, and they are doing great," a source close to the family tells Us. "Kevin is really excited to be an uncle."

Cameron was arrested last year for serving alcohol to minors, among other charges. Britney Spears reportedly attended Cameron's high school graduation in his hometown of Pendleton, Oregon, while married to Federline.

Click here to see Spears and her boys through the years.