She captioned the image: Bow down Bitches! #whatitfeelslikeforagirl.(sic)"
Cannes, Aug 18 - Model Kate Moss partied with singer Madonna at her 1920s-themed birthday party organised here over the weekend.
The Frozen hitmaker turned 56 on Aug 16.
Moss joined Madonna in celebrating her birthday at a lavish party at a private villa here, where the two were pictured cosying up together, reports contactmusic.com.
Madonna posted the photo of herself wearing a beaded black dress next to the model, who was clad in a strappy black gown, on her Instagram account Sunday.
She captioned the image: Bow down Bitches! #whatitfeelslikeforagirl.(sic)
Her children -- Lourdes, 17, Rocco, 14, David, 8, and Mercy, 8 -- also attended the birthday bash.