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:
1 - Felipe Massa (Formula 1) 2 - Rubens Barrichello (Formula 1) 3 - Bruno Senna (Formula 1) 4 - Lucas di Grassi (Formula 1) 5 - Vitantonio Liuzzi (Formula 1) 6 - Jaime Alguersuari (Formula 1) 7 - Pastor Maldonado (Formula 1) 8 - Adrian Sutil (Formula 1) 9 - Jules Bianchi (GP2 Series-Formula 1) 10 - Jorge Lorenzo (MotoGP) 11 - Tony Kanaan (IndyCar) 12 - Helio Castroneves (IndyCar) 13 - Bia Figueiredo (IndyCar) 14 - Vítor Meira (IndyCar) 15 - Pietro Fittipaldi (LLM-Nascar) 16 - João Paulo Oliveira (GT Series - Japan) 17 - Cacá Bueno (Brazilian Stock Car-Trofeo Linea) 18 - Popó Bueno (Brazilian Stock Car-Trofeo Linea) 19 - Christian Fittipaldi (Trofeo Linea) 20 - Marcos Gomes (Brazilian Stock Car-Trofeo Linea) 21 - Leonardo Nienkötter (Trofeo Linea) 22 - Antonio Pizzonia (Brazilian Stock Car) 23 - Ricardo Zonta (Brazilian Stock Car) 24 - Xandinho Negrão (Brazilian Stock Car-GT3 Brazil) 25 - Max Wilson (Brazilian Stock Car) 26 - Luciano Burti (Brazilian Stock Car) 27 - Allam Khodair (Brazilian Stock Car-Trofeo Linea)