NBC's new series "One Big Happy," the story of a lesbian who's having a baby with her dude best friend, may have been considered outlandish 20 years ago. But as one of the show's stars, Kelly Brook, told HuffPost Live on Thursday, it's just a reflection of the ever-expanding definition of what family means. Brook, who plays the soon-to-be father's new girlfriend named Prudence, explained to host Ricky Camilleri that the show's creator and writer, Liz Feldman, had a similar situation of wanting to have a child with her best friend.