Australian Mark Webber has claimed the Brazilian Grand Prix, the second race win of his career, while Jenson Button sealed his first world title on in action-packed day in Sao Paulo.

Webber, in a Red Bull, won comfortably ahead of Pole Robert Kubica in a BMW Sauber and third-placed outgoing drivers’ champion Briton Lewis Hamilton in a McLaren Mercedes.

German Sebastian Vettel, in the second Red Bull, was fourth ahead of Button with Finn Kimi Raikkonen sixth for Ferrari.

Swiss Sebastien Buemi of Toro Rosso was seventh and the luckless local hero Rubens Barrichello, in the second Brawn, eighth after starting from pole position.

He suffered from heavy traffic and then a late puncture that wrecked his hopes of glory.

Button, who has led the championship all season after winning the opening Australian Grand Prix in March, had started 14th on the grid, but drove with courage and determination to achieve his goal and send the Brawn GP team into wild celebration.

“We are the champions,” Button sang out of key from his cockpit after crossing the finishing line and capturing the title with one race to spare.