According to Britain’s The Sun, the two have been sharing an on-again/off-again relationship since their original split, which was the result of Law having an affair with his children’s nanny.
The couple were spotted together recently enjoying a night out with friends in Hollywood. During the evening, Law kept an arm around Miller.
In April, witnesses say that the two shared an intimate dinner at a Santa Monica restaurant, where they were spotted, "kissing and holding hands".
Sienna Miller has just completed filming the movie Factory Girl in New York. She lost 5 to 7 pounds for the role, and therefore now enjoys a smaller breast size of 32B. She told her friends, "I don’t even need a bra now. It’d be wonderful to have some womanly curves again, I dream about it."