kevinfedX17230.jpgKevin Federline is a dad ... once again! Britney Spears' ex hubby's girlfriend Victoria Prince has given birth to Jordan Kay, according to Us.

Prince, 28, delivered their little girl on Monday just after 6:30 p.m.

Federline, 33, is already the father to four other children - Sean Preston, 5, and Jayden James, 4 with Britney Spears ... and daughter Kori, 9, and son Kaleb, 7 with actress Shar Jackson.

Federline and Prince have been dating for two years.