Rathbone's new wife Sheila Hafsadi gave birth to the couple's first child last year (12) and now the movie vampire is urging the boy's godmother to start making family plans with her musician husband Paul MCDonald.
He says, "Nikki will be an amazing mom, so we're trying to infect her with baby fever so we can have an amazing kid for Monroe to play with. We want him to have a little buddy."
And is seems little Monroe will have a sibling or two in the very near future - his proud dad is keen to add to the family.
He tells People.com, "We kind of hope that we’ll have twins, a little boy and girl."