#23: He Begins Dating Sienna Miller While Filming Alfie
He began dating Sienna Miller after they worked together on Alfie, the 2004 remake that cast him as a charming, restless womanizer. Their relationship quickly became one of the defining celebrity romances of the mid-2000s, partly because they were young, glamorous, British, and constantly photographed.

The timing also made the relationship hard to separate from his career peak. Law was everywhere on-screen, while Miller was becoming a major name herself, and together they became a tabloid fixation just as his private life was entering a much harsher spotlight.
