Jude Law’s rep confirmed yesterday that the actor was expecting a secret love child this fall with an anonymous woman. Now, sources have come forward identifying Jude’s Sherlock Holmes costar Rachel McAdams’ sister Kayleen as the mother of the baby.

Make-up artist Kayleen who reportedly hooked up with Jude around Christmastime in NY last year, is now seven months pregnant with what some people think is Jude’s kid. She kept the pregnancy a secret until recently. Jude told his ex-wife Sadie and his three kids about the upcoming baby on Tuesday. Sources say that Rachel is really upset over the whole situation.

Update: TMZ has just disproved this claim by getting an actress/model named Samantha Burke to confirm that she’s in fact the baby momma of Jude’s new kid. Read more about her here.