"Girl You Know It's True" is a song that became the first big hit for Milli Vanilli. Released as the lead single from Milli Vanilli's European debut album All or Nothing, and the duo's American debut album, Girl You Know It's True, the song peaked at number one on the German Singles Chart, number two in the United States and number three in the United Kingdom, becoming one of Milli Vanilli's most successful singles.

The song lyric skipped and repeated during a Milli Vanilli concert in Connecticut, revealing a case of lip synching during the performance and setting off a wave of controversy for the group.