Charles Sykes / Invision/AP 1 / 17
Charles Sykes / Invision/AP 1 / 17

LONDON (AP) — Handwritten letters from Rolling Stones frontman Mick Jagger to his former lover Marsha Hunt will be auctioned in London next month.

RELATED: Aging Rockers: Still Hot or Not?

Hunt is an American-born singer who was the inspiration for the Stones' 1971 hit "Brown Sugar" and bore Jagger's first child.

RELATED: Foxy Over 50

Sotheby's says she has tasked the auction house with selling 10 letters written from the set of Jagger's film "Ned Kelly," which was shooting in Australia.

RELATED: Jade Jagger weds Adrian Fillary

Sotheby's says the "passionate and articulate" letters sent in the summer of 1969 show a "poetic and self-aware" 25-year-old Jagger.

The auction house said Saturday that the collection, which includes song lyrics and a Rolling Stones playlist, is expected to fetch between 70,000 and 100,000 pounds ($111,300 and $159,000) and will go under the hammer on December 12.