India, March 25 -- F ormula One driver Lewis Hamilton has reportedly joined social media star and businesswoman Kim Kardashian and her children for a spring break trip in Japan, fuelling speculation that their relationship may be more than just friendship. Kim, 45, is currently in Tokyo with several of her children - Saint, Chicago, Psalm, and North - whom she shares with ex-husband rapper Kanye West. According to People magazine, Hamilton, 41, has been spending time with the family during the trip. Kim's sister Khloe Kardashian is also reportedly present with her children. Sources say Hamilton has made a strong impression on Kardashian's inner circle, describing him as easygoing with great energy. They added that while both have demanding careers, they make time for each other and share more than a casual connection. Rumours had already been building before the trip, particularly after Hamilton reacted with a heart emoji to Kim's Instagram post from the Vanity Fair Oscars Party on March 15....