Laura Prepon and Ben Foster had a case of the giggles when they attended the NYC premiere of Five Came Back on Monday night. The engaged couple — who is expecting their first child together [1] — shared a few laughs as they posed for photographers on the red carpet. While Ben looked lovingly at his fiancée, Laura flashed a huge grin as she cradled her baby bump. Ever since announcing their engagement in October [2], the two have had no problem showing off their sweet love in public, and we can't get enough.