Article continues below advertisementEstranged spouses Kyle Richards and Mauricio Umansky recently reunited at a friend's birthday party.Actress Bijou Phillips posted an Instagram Story from skincare founder Tina Chen Craig's celebration, which she captioned "S--- birthday Tina!"Article continues below advertisementKyle Richards and Mauricio Umansky Spotted TogetherSource: @bijouphillips/InstagramMauricio Umansky was spotted looking happy behind Kyle Richards at Tina Chen Craig's birthday party. Alongside Phillips and Craig sat Richards' nieces Nicky Hilton and Paris Hilton.