10 Celebrity Couples Who Fell in Love After Playing Onscreen Siblings

Following Everwood's cancellation and the end of her relationship with Chris Pratt, Emily signed on to play Rebecca in Brothers & Sisters in 2007. If the title of the show is any indication, Rebecca was the presumed sister of Justin, played by Dave Annable. In an interesting turn of events, Emily and Dave supposedly had so much chemistry off screen as IRL boyfriend and girlfriend that the writers of the show cooked up a paternity scandal that made Rebecca and Justin unrelated, so they could have them start dating and eventually get married on the show. However, just like their characters' doomed relationship, Dave and Emily later broke up, and he married actress Odette Annable in 2010.