The mystery mama carrying actor Jude Law's fourth child has been revealed: It's Samantha Burke, a 24-year-old actress, model, and ex-Law lover. DNA tests confirmed the notorious playboy's paternity, reports TMZ. Burke's due date is October 6, according to her online registry at Babies "R" Us, which also reveals that she's expecting a girl she'll name Sophia. "Since informing Mr. Law of the pregnancy, he has been nothing but responsive and supportive of Ms. Burke and the pregnancy," said a statement issued by Burke's attorneys. Law has three children with former wife Sadie Frost, and is currently single.