Delivery Man (2013)

An affable underachiever finds out he's fathered 533 children through anonymous donations to a fertility clinic 20 years ago. Now he must decide whether or not to come forward when 142 of them file a lawsuit to reveal his identity.

Director: Ken Scott
Writers: Ken Scott (screenplay), Martin Petit (original screenplay "Starbuck")
Stars: Vince Vaughn, Chris Pratt, Cobie Smulders
Source : IMDB