Sotheby's had this: "DESCRIPTION three-quarter length, seated, wearing a satin gown and shawl, resting her arm on a draped table later inscribed c.l. with the identity of the sitter oil on canvas, unlined, in a carved wood frame
The sitter was the third daughter and co-heiress of John Carteret, 2nd Earl Granville (1690-1763) and his wife Frances, daughter of Sir Robert Worsley. Her first marriage was to John Spencer, son of Charles 3rd Earl of Sunderland, a match which was encouraged by Spencer's formidable grandmother Sarah Duchess of Marlborough. They were married on St Valentine's Day 1734 and shortly before the wedding John Spencer was granted Sunderland House in Piccadilly together with the family's estates in Northamptonshire and Bedfordshire. Despite Spencer's loose living the marriage was a happy one and Georgina was much admired for her charm and beauty. On Spencer's death in 1746 the estates passed to their young son John, later 1st Earl Spencer. Georgina subsequently married William, 2nd Earl Cowper."