A portrait Picasso painted of his teenage mistress sold for $36 million in London Tuesday. The artist met the 17-year-old blonde, Marie-Therese Walter, outside the Paris metro in 1927. Icebreakers are apparently pretty easy when you’re a world-famous artist; Picasso approached her and said, "I am Picasso. You and I are going to do great things together.'' They remained together—albeit secretly—for many years.