Leonardo DiCaprio has played matchmaker to help his beloved mother find love again. Irmelin Indenbirken, who divorced the actor's dad George when he was a baby, joined her son at an Independence Day (04Jul13) party hosted by Madonna's manager Guy Oseary in Malibu, California, where she showed off her beau of one year, a suitor named David, and it appears she has the Titanic star to thank for the new man in her life. A guest who asked David about his romance with Indenbirken tells the New York Post's Page Six column, "He said Leo and his (own) daughter, the wife of a Black Keys band member, set them up on a blind date, and they've been together ever since." The source adds, "The two danced next to Leo... and partied away until the wee hours." The holiday bash was a double date for the mother and son - DiCaprio was joined by his new girlfriend, Victoria's Secret model Toni Garrn, who he has been dating since May (13). Other guests at Oseary's lavish party included Charlize Theron, Owen Wilson, Mel Gibson, Woody Harrelson and George Clooney's girlfriend, Stacy Kiebler.