The couple called off their engagement last July, after Law admitted he had an affair with his children's nanny, Daisy Wright.
After reconciling last autumn, the pair once again called it quits in January. Miller has since been romantically linked to her Factory Girl co-star Hayden Christensen and Argentine model Nico Malleville.
Sources tell Us Weekly the couple have reunited hoping that the third time is indeed the charm.
They were spotted last Saturday having a romantic dinner in Santa Monica, California, and according to an eyewitness they were "kissing and holding hands" throughout dinner.
A source tells the magazine, "They have a weird hold on each other that will never let go."
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