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Richards divorced the troubled actor in 2006 and they endured a nasty court battle and a public war-of-words during the separation.
They have since mended the rift for the sake of their two daughters, Sam and Lola, and they have even been enjoying family holidays together, including a Christmas vacation with their girls and Richards' newly adopted baby girl, Eloise.
Richards tells "Access Hollywood" that they are now closer than ever: "We've actually become like brother and sister, we really have. We've become very, very good friends, and we wanted to have a trip with our daughters. ... We actually get along. ... If you're divorced, it's no longer about you anymore. ...(The key is) making it about the kids. You have to be the bigger person and make it about the kids, and so that's what we're doing."