Parting ways on good terms is one thing. But becoming friends with your ex's new partner? Seems like a Herculean feat. Or does it? After all, if your ex has a type, you and their new boo probably have a lot in common. Throw some shared kids in the mix and you all have to get along when it comes to spending time together as a family. In most cases, people just grin and bear it, but these celebrities have taken healthy breakups to an inspiring new level.