The group scored their first number-one hit with "Where Did Our Love Go", paving the way for unprecedented success: between August 1964 and May 1967, Ross, Wilson, and Ballard sang on ten number-one hit singles, all of which also made the UK top 40. The group had also become a hit with audiences both domestically and abroad, going on to become Motown's most successful vocal act throughout the sixties. Following significant issues with her comportment, weight, and alcoholism, Florence Ballard was fired from the Supremes by Gordy in July 1967, hiring Cindy Birdsong from Patti LaBelle and the Blue-Bells as Ballard's replacement.