reportedly has a new love interest.
The Oscar-winning actress - who recently split from Burberry
model Louis Dowler - is said to be enjoying a new romance with a mystery man and the pair were spotted having a three-hour lunch together last week at exclusive London restaurant Scott's.
An onlooker told The Mail on Sunday newspaper: "Kate enjoyed oysters and a chocolate fondant dessert - she was eating the food of love.
"She looked very content. They were chatting for hours. She was in fits of giggles at one stage and then later they looked very serious together.
"It seemed they were having an in-depth discussion and she clasped his hands over the table. When Kate finally paid the bill, it was getting dark."
When the pair - who have known each other for years - finally left, they asked waiters to arrange for them to leave separately as they didn't want anyone to see them together.
The 'Titanic' star split from Louis in November saying she wanted some time alone following the breakdown of her marriage to director Sam Mendes in March.
A source close to Kate - who has a seven-year-old son, Joe, with Sam, as well as a 10-year-old daughter, Mia, from her first marriage to Jim Threapleton - said of the split: "Louis was just the tonic Kate needed after her painful split from Sam and they had a wonderful time. However, the relationship
isn't working and Kate needs space to be on her own.
"She is very grateful to Louis for helping her pick her life back up after her marriage ended and they had a lot of fun together, but she felt it had come to an end and wants to concentrate on her career and children."