Felipe Massa has secured the highest number of F1 driver entries ever for his annual charity kart race - with six of his current on-track rivals signing up for the event.
Rubens Barrichello, Bruno Senna, Vitantonio Liuzzi, Jaime Alguersuari, Pastor Maldonado and Adrian Sutil have all agreed to take part in the International Challenge of Go-Kart Champs, which takes place in Florianopolis on December 2-4.
As well as the F1 regulars, Pirelli test driver Lucas di Grassi, MotoGP's Jorge Lorenzo, Ferrari reserve driver Jules Bianchi and IndyCar race winners Tony Kanaan and Helio Castroneves are all confirmed.
Sebastien Buemi and Sergio Perez are also considering invitations to attend the event, but have not yet finalised their plans.
The full entry list so far is: