<p>In the 1880s, Suzanne Valadon was considered the Impressionists' most beautiful model. But behind her captivating façade lay a closely-guarded secret.<br><br> <br><br>Born in poverty in rural France, as a teenager in Montmartre, Suzanne began posing for ? and having affairs with ? some of the age's most renowned painters. Then Renoir caught her indulging in a passion she had been trying to conceal: the model was herself a talented artist.<br><...