Hochzeitstag), also known as Self-Portrait on the sixth wedding anniversary and Self-Portrait on the sixth anniversary of marriage, is a painting by the German painter Paula Modersohn-Becker, one of the most important early expressionists, from the time of her stay in Paris in 1906.

Her upper body is naked and on her neck she wears an amber necklace.

When Paula Modersohn-Becker painted this self-portrait, she was not pregnant, unlike what the picture appears to show.

Paula Modersohn-Becker painted another nude self-portrait in Paris during the summer of 1906, which is in the Kunstmuseum Basel in Switzerland.

By 1916 it was owned by her daughter Tille Modersohn and loaned to Bernhard Hoetger in Worpswede.