Katie Holmes conceived her baby with fiance Tom Cruise without the aid of in-vitro fertilisation (IVF) treatment, according to the Hollywood beauty's aunt.

Carol Zydorczyk has spoken out to deny reports pregnant Holmes received IVF treatment.

She says: "I can assure you they did it the old fashioned way."

Batman Begins star Holmes and Cruise announced her pregnancy last week, just six months after the couple began dating.