Ben Affleck and HEROES star Greg Grunberg are California's top 'sperminators', according to a new survey.
California Cryobank officials asked wannabe mums to pick the perfect famous father from a group of lookalikes, who had donated sperm - and most went for Affleck and Grunberg.
Fast & The Furious hunk Paul Walker's doppelganger was also popular, as was Scott Caan's, Bradley Cooper's and Gerard Butler's.
The Cryobank bosses charge $280 (£187) a vial, according to In Touch magazine.