In a move which is bound to cause ex-boyfriend Owen Wilson further heartbreak, actress Kate Hudson stepped out with her new love – and Wilson’s friend - cycle legend Lance Armstrong.

The pair were seen leaving their hotel in Monaco together to take a boat trip.

They arrived in Monaco after partying at designer Dolce and Gabbana's party in Cannes where they were seen kissing and cuddling.

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Kate and Lance flaunted their new romance on board a yacht in Monaco at the weekend. The pair were in Monaco to watch the Formula 1 Grand Prix

The seven-times Tour de France winner stepped went public with Miss Hudson, who announced her split from Wilson a fortnight ago.

It will no doubt come as a serious blow to Wilson, 39, who following his split from Miss Hudson, 39, last summer, attempted suicide shortly after she was spotted kissing another actor.

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Actress Kate with Lance Armstrong and Dr. Vijay Mallya, Force India F1 Team Owner at the Kingfisher boat party on the Indian Empress in Monaco

Champion cyclist Lance Amstrong and actress Kate Hudson leave their hotel in Monaco yesterday after going public with their relationship

They rekindled their relationship briefly in March this year but their relationship stalled again, and now Miss Hudson, 29, has clearly moved on.

Friend: Owen Wilson seen in a bar in New York on the weekend. He is said to be a good friend of Armstrong's

It is the second time Armstrong, 36, has moved in one of Wilson’s exe’s.

He previously had a three-year romance with singer Sheryl Crow only to see Armstrong move in after they split and get engaged to the pop star.

A source said: "Kate and Lance have been dating for a couple of weeks. She thought it was funny when people were writing recently that she was engaged to Owen because the reality was that they had split again and she was secretly seeing Lance.

"She and Lance are both physical, passionate people, she's never been happier."

Miss Hudson started dating Armstrong after sparks flew at a private New York dinner party.

The source said: "They have known each other for a while and Lance is one of Owen's good friends.

“When Kate was with Owen, she got to know Lance really well but they hooked up again recently at a dinner party thrown by a mutual friend and that's when the romance began.

"They have both been keeping it very quiet."

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Ex-loves: Hudson with ex-boyfriend Owen Wilson last year, and Sheryl Crow with Lance Armstrong before their split in 2006

Miss Hudson's marriage to singer Chris Robinson, by whom she has a five-year-old son Ryder, broke down in 2006 after she had filmed You, Me And Dupree with Wilson.

They begun a relationship which ended last June with reports that she had grown tired of his lack of commitment.

But after pictures of Miss Hudson kissing Dax Shephard emerged in gossip magazines, the story took a chilling turn when Wilson was discovered with a bottle of pills and slashed wrists at his Los Angeles home.

Miss Hudson was devastated and supported Wilson, even rekindling their romance briefly in March.

Wilson spoke gloomily about his lack of success with women after he split up from Sheryl Crow in 2002: "I was lucky enough to find a great girl, and because of my lack of, I don't know, focus, the relationship went south.

"The complaints of my girlfriends sound a lot like the comments I used to get from my teachers: 'Owen is lacking in seriousness. He's not working up to his potential.'"

The same cannot be said of world beating cyclist Armstrong, born only a few miles from Wilson.

He beat testicular cancer that had spread to his brain and lungs in 1996, going on to win by almost superhuman effort the Tour de France a record-breaking seven consecutive times.

Miss Crow put her career on hold to support Armstrong's bid for global cycling supremacy, joining him on the podium after he won his seventh Tour victory in 2005.

When he retired from the sport, Armstrong turned up for her concerts and TV appearances.

But then, in February 2006, they split up. Armstrong is believed not to have wanted more children (he had three from his marriage to wife Kristin Richard,which ended in divorce in 2003, using sperm frozen before his gruelling chemotherapy treatment).

Miss Crow adopted a baby boy a year later.