Justin Timberlake and Cameron Diaz's amicable split took a turn for the worse on Monday night (15JAN07) when the former couple had a heated public argument at Prince's Golden Globes afterparty. The pair released a joint statement last week (11JAN07) announcing they were no longer together after dating for nearly four years. The exes chatted politely during the actual awards ceremony and even shared laughs at InStyle magazine's annual afterparty. But things started to go badly later when Diaz approached Timberlake at Prince's Beverly Wilshire hotel bash, while the singer was chatting to actress Jessica Biel. Witnesses tell American publication People that Biel stepped away and the former couple were soon spotted in an intense 40-minute face-off in a side room. The CHARLIE'S ANGELS star emerged from the room looking composed, but Timberlake was seen holding his head in his hands and, according to a witness, "slammed his fist into a cabinet".