Handwritten letters from Rolling Stones frontman Mick Jagger to his former lover Marsha Hunt will be auctioned in London next month.Written by Mick Jagger in July and August of 1969, the notes were sent to Marsha Hunt, the American singer with whom the legendary frontman had his first child. Hunt is said to have been the inspiration for the Stones "Brown Sugar," which you can hear below in a live rendition from a concert in Texas in 1972.