Diaz, who dated Timberlake from 2003 to late 2006 and starred with him in the 2011 movie Bad Teacher, said in an interview she will always love him in different ways.
Sources says Diaz's comment sent Biel hopping mad.
"Jessica has always been threatened by Cameron's close relationship with Justin. And she believed Cameron was saying that if Justin was having second thoughts about the wedding, she would be waiting for him with open arms," showbizspy.com quoted a source as saying.
"Jessica was deeply concerned that Justin could be getting cold feet about marriage. She basically told him that if he didn't cut contact with Cameron, he could forget about marrying her," added the source.
"The wedding is on and imminent. But Cameron's interview really threw Jessica for a loop. It has her questioning Justin's trust and commitment right down to the wire," said the source.
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