Model and actress Kim Porter, who dated rapper P. Diddy for 13 years and is the mother of three of his children, is dead. She was 47.Porter died on Thursday at her Toluca Lake, California, home, a source said.According to tmz.com, Porter went into cardiac arrest on Thursday at noon after suffering from pneumonia for several weeks, though her official cause of death has not yet been revealed. Diddy and Porter have three children together. Christian Combs was born in 1998, followed by twin girls Jessie James and D’Lila. Diddy and Porter began dating in 1994 and were on and off until their final break-up in 2007. (IANS)