What's a Girl to Do? "What's a Girl to Do?" is the follow-up single to the previous Australian hit "Sister" by Australian sisters/band Sister2Sister. The song reached number five in Australia, number 25 in New Zealand, and number 61 in the United Kingdom. It is featured on the 2000 teen film "Bring It On". In Australia, the single debuted at number 10, staying there for two weeks before falling to number 11. It then climbed to its peak of number five and stayed there for two weeks before falling out of and rising back into the top 50. It spent a total of 20 weeks (like its predecessor) in the top 50. In New Zealand the single debuted at number 40 before falling to number 44, then peaking at number 25 and falling out the next week. It then re-entered two weeks later at number 30, then fell out for the last time, bringing its top 50-week total to four. In the United Kingdom, the single debuted at number 61, and fell out the next week. Australian CD single  UK CD1  UK CD2