Expectant parents Nicole Kidman and Keith Urban are having a boy - if you believe Hollywood-based celebrity blogger Perez Hilton.

Quoting "sources close to Nicole", Hilton's website has announced it can "reveal exclusively" a baby boy is on the way for the Academy Award-winning actress and her Grammy Award-winning country crooner husband.

A guessing game began a week ago when the Australian glamour couple walked the red carpet in Las Vegas for the Academy of Country Music Awards and mentioned they knew the sex of the bub, but were keeping mum about it.