"Girl's Best Friend" is a 1999 single by rapper Jay-Z that features vocals from Mashonda. It was released on August 9, 1999, as a single to promote the comedy film Blue Streak and appears on its soundtrack Blue Streak: The Album. In the same year, it appeared as a hidden track on Jay-Z's fourth album Vol. 3... Life and Times of S. Carter. Its beat, produced by Swizz Beatz, contains a sample of "Keep It Comin' Love" by KC and the Sunshine Band.
Martin Lawrence, the star of Blue Streak, makes a cameo in the music video (directed by Francis Lawrence) as his character's "Pizza Man" disguise, dancing to the song and making silly faces in the camera.