Madonna has finally signed up to Instagram - and her first two photos haven't disappointed fans.
The 54-year-old mega star posted a photo of her sipping a dirty Martini, wearing a lacy bra top.
She wrote alongside it: "Cheers motherf*ckers! I'm on Instagram."
Along with a few other black and white stage shots and 'Election night 2012', she uploaded an extreme close-up picture of her heaving cleavage and dripping face.
She captioned it with: "Addicted to sweat!!!!!"
