Don't Bet On It (Hannah Montana #10) by Ann Lloyd

Glamour Girl!

As pop star Hannah Montana, Miley Stewart has it all--designer clothes, fame, fans, and fortune. But there's one thing Hannah doesn't have--a driver's license! When she gets the chance to strut the catwalk in the Stella Fabiana Fashion Show, there's no-one to give Miley a ride.
Then her brother, Jackson, makes Miley a bet she can't refuse . . . If Miley can get through a day of babysitting their neighbour's demanding young niece, Jackson will not only give Miley a ride to the show,, he'll drive her around anytime she wants. But if Miley loses, she'll be stranded--forever!