United Kingdom, March 24 -- Kim Kardashian is "very into" Lewis Hamilton, as they holiday in Japan together.

The couple have been romantically linked in recent months, and they have now been spotted together in Tokyo, alongside Kim's three younger children, Saint, 10, Chicago, nine, and Psalm, six - who she shares with her ex-husband Kanye West - and her sister Khloe Kardashian and her children, True, seven, and three-year-old Tatum.

A source told PEOPLE: "He's just an easy-going guy with great energy.

"Her family likes him and Kim's very into him.

"They are both busy with their careers, but see each other as much as possible."

Kim and F1 star Lewis are said to have "more than just a casual connection".

The source added: "It takes a...