Srimati Radharani is the eternal consort of Lord Krishna. Five thousand years ago, when Lord Krishna came to this planet to perform His pastimes, Srimati Radharani also appeared.
This is what Janmashami looks like at my house. New green outfits and a crown each for Gaura-Nitai and fresh garlands made from sweet smelling pink and white stock and rose petals, with stock hanging garlands and roses around their altar.