Sources close to Packer told the publication that she and the artist, 54, have been dating for eight months, after meeting through their children who attend the same school in Los Angeles.
Martinez, who was married to Alexandra Marshall for 16 years, splitting in 2015, has four children from his previous relationship, while Packer is mum to Indigo, Jackson and Emmanuelle - her kids from her six-year marriage to the Australian mogul.
“They are very much in love and together,” a friend told The Daily Telegraph.
“Erica is beside herself and definitely wants to marry Enrique.
“They’ve been dating for about eight months but, true to Erica’s style, have kept their romance as low-key as possible.”
Speaking about her ex, she has said, “Whoever you are, it’s okay to stick your hand in the air and say, ‘I’m not doing so great … I need help.’”
“I’m proud of James, and that he put his hand up.”