Kate Hudson and Cameron Diaz are allegedly exchanging words over Hudson’s ex and Diaz’s current boyfriend Alex Rodriguez.

According to US Weekly, the Almost Famous star is upset that Diaz has been seen leaving the baseball player’s apartment on numerous occasions.

“Kate hates Cameron. She’s p*ssed Cameron is dating A-Rod,” said an insider.

Hudson apparently believes that Diaz is retaliating after the Fool’s Gold actress starting seeing Justin Timberlake merely days following the singer and Diaz’s split in 2007.

“Kate thinks it’s payback, pure and simple. Kate thinks Cameron is an ageing old lady actress struggling to remain sexy and relevant,” the source continued.

However, a friend of Diaz added: “She thinks it’s a joke Kate would be mad… Kate is only upset because she hates being single.”