Leonardo DiCaprio and Gisele Bundchen's split has been blamed on a mystery third party.The star couple are said to have ended their on-off relationship for good because one of them has fallen for someone else, US reports have claimed. New York Post gossip column Page Six reports: "We hear that Leonardo DiCaprio and Gisele Bundchen, after dating for several years, have called it quits for good. We don't know why yet, but we expect to hear about a third party"Leonardo and Gisele reportedly decided to call time on their relationship last month after a series of arguments. The star pair have always had a rocky relationship since they started dating four years ago.Gisele split briefly from Leonardo last year, after reportedly becoming tired of waiting for him to propose. The Brazilian beauty previously ditched Leo in 2001 after a huge row over his partying with friends.But the handsome actor won her back several months later after bombarding her with flowers and phone calls, and taking her on a romantic holiday to Hawaii.Leo once said of Gisele: "Part of being in a relationship is loyalty, and I will say that Gisele is a wonderful human being"

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