The 30-year-old singer announced on Twitter that she has put her "hardly worn" second-hand designer garments - including a Chanel handbag and Givenchy boots - up for sale on online retail website Vestiaire Collective.
Along with a link to the clothes, Allen shared, "Who would like to buy some of my hardly worn clothes on the wonderful @VestiaireCo? Go go go (sic)."
Two dresses - one Alexander McQueen and one Isabel Marant - have already been sold, but there are still pair of Chloe boots and a Prada bag up for grabs, among many other items.