Madonna posts first family PHOTO with ALL her kids at 59th birthday party

This is the first pic we've ever seen of Madonna with her 6 kids.

The photo was taken in celebration of the singer's 59th, gypsy-themed birthday party in Italy.

Check out Rocco, 17, David, 11 Lourdes, 20, Mercy James 11, and 4-year-old twins Estere and Stella.
The proud mama made a grand entrance, riding a horse into the party but, appropriately -- not in a Lady Godiva way.

Happy birthday queen!!! 🎂❤