 " The Girl Is Mine " achieved success in the music charts . Aside from topping the R & B singles chart , the single peaked at number two on the Billboard Hot 100 and number eight in the UK . By 1985 , it had sold 1 @.@ 3 million copies , and was eventually certified platinum by the Recording Industry Association of America , for shipments of at least one million units . Despite the song 's success , it received generally mixed reviews from critics who consider it to be the weakest song on Thriller . 
