Pop star Kevin Jonas is nervously awaiting the outcome of his sister-in-law's driving test on Tuesday - because he has been coaching her.

Katie Deleasa is taking her test on her 17th birthday and the Jonas Brothers star is anticipating her passing with flying colors.

He says, "I took her in my car and tried to help her learn how to parallel park... I'm crossing my fingers for her; I'm praying for her that she passes because that's the worst thing - you wait this long to get your license and then you don't pass the test on the first time."

But he won't be buying her a car if she does pass: "Her dad actually came through, got her an old-school BMW convertible - so cool!"