United Kingdom, Oct. 15 -- Cardi B thinks she was "born" with a relentless work ethic.

The 33-year-old rap star believes that hard work has been one of the keys to her success, but Cardi doesn't know whether her kids will share the same traits.

The chart-topping star - who is currently pregnant with her fourth child - told PAPER Magazine: "You really have to be born with it, because you could be in a household where you see both your parents or a parent, or you see a single mother working their a** off, and yet you still wouldn't have that drive.

"You could grow up in poverty, or you could grow up in a very wealthy family; if you don't have it in you, you just don't have it in you. It's almost like you have to hope that your kids have ...