The ‘Titanic’ actor flew in from South Africa to meet with Kelly in London.

After wooing her with chocolates and roses, the couple spent the night together at a luxury hotel.

Kelly - who broke off a holiday in Newquay, South West England, to see Billy - has since agreed to give their four-year relationship another chance.

Although there was no sign of her ￡35,000 engagement ring, Kelly looked happy as the couple enjoyed dinner at a Thai restaurant.

One source told Britain’s The Sun newspaper: “Billy looked like the cat who got the cream. But she was teasing him - it looked like she was keeping him on his toes.”

Speaking about the pair’s relationship, Kelly previously said: “It's never me that is the first one to make up. We're both romantics so there's lots of magic. I've met someone I want to do everything with. He's my best friend really. I've never had that before.”

The couple were originally set to marry last year but had to postpone the nuptials following the death of Kelly’s father.