Twinka Thiebaud (born December 9, 1945) is an American model who has posed for many of the most important photographers of the 20th century. A photograph by Judy Dater depicting Thiebaud, Imogen and Twinka at Yosemite, is considered among the most iconic photos in art history, and was the first adult full-frontal nude photograph published in Life magazine. Another photo of Thiebaud by Dater is included in The Woman's Eye (1973), a book devoted to women photographers, and also served as the cover image.