Reality queen Kim Kardashian has raced into a relationship with Formula 1 hunk Lewis Hamilton – but pals are warning her to buckle up because the notorious womanizer may leave her with a broken heart, Breaking Celebrity News can reveal.

"Kim knows she's dating one of the biggest players in entertainment, but truth be told, that's a huge part of Lewis' appeal. She wants a guy who's going to challenge and stimulate her – not a pushover type who's intimidated by her fame level or low on experience when it comes to dating," an insider shared.

"The big issue she's overlooking is that Lewis still has plenty of women he can call on, and he's not looking for anything much more than an extended booty call. The guy swore off serious relationships literally years ago and prides himself on bed-hopping – whether Kim chooses to accept this reality or not."

The California-based billionaire, 45 – who shares kids North West, 12, Saint West, 10, Chicago West, 8, and Psalm West, 6, with ex-husband Kanye West – and the British racing champ, 41, were spotted taking a private flight together from the U.K. to France – weeks after reportedly attending the same New Year's Eve bash in Aspen, Colo.