VIDEO : Timothy Olyphant, Shay Mitchell, Britt Robertson Join ?Mother?s Day? Comedy

Timothy Olyphant , Shay Mitchell, and ?Tomorrowland? star Britt Robertson have joined Open Road?s ensemble cast for the romantic comedy ?Mother?s Day.? Olyphant plays the ex-husband of Jennifer Aniston?s character and Mitchell will play his new wife, who wants nothing more than to be the perfect stepmom.