 "Bad Girls" became a worldwide success, peaking within the top-ten in seven countries, including Spain and New Zealand.In the United States, it spent five weeks at number-one on the "Billboard" Hot 100, from the weeks of July 14, 1979 to August 11, 1979; and sold over two million copies, simultaneously becoming, alongside "Hot Stuff", her most successful single.The single, which was the second-biggest song of 1979, also helped the "Bad Girls" album to reach the multi-platinum status in the US.