Dated Rufus Sewell. Dated Stephen Tredre. [1991-1995] Kate met husband, James Threapleton in 1998 on the set of her movie Hideous Kinky where he was working as an assistant director. Married director Sam Mendes in a private ceremony whilst on holiday in the West Indies in May, 2003.

Kate has the characteristics of a workaholic's attitude and a craftsman's attention to detail. Even while pregnant, she kept a busy movie production schedule and a devotion to properly researching her parts. Kate's maturity for such a young actress is well known. "

After her first success in the film Heavenly Creatures (1994) a reviewer predicted that she would always be associated with that character, and would never be a big star. On the day she had to film the straighjacket scene in Hamlet (1996), she learned she had won the role of Rose in Titanic (1997). Missed the premiere of Titanic (1997) because she was attending the funeral of close friend and former boyfriend, Stephen Tredre.