Button celebrated title alone in hotel
The Briton had been scheduled to return to Europe on Sunday evening for a PR commitment, but his Brawn teammate Rubens Barrichello offered the use of his private jet so that he could stay another night in Sao Paulo.
But it emerges that Button, 29, stayed less than an hour at the team's party before returning to his hotel.
"I wanted a bit of alone time," he told British reporters, drinking a glass of white wine and wearing a t-shirt that read 'What goes around, comes around'.
"We all celebrate it in different ways, and for me to just chill on my own was the best thing for me. I was on the phone to my girlfriend, my family as well, my mum, so I was up until about 4am just lying in bed with a big grin on my face," said Button.
He also responded to reports that he is locked in a dispute with Brawn bosses over the size of his 2010 retainer, despite chief executive Nick Fry saying the Briton is very likely to stay with the Brackley based team.
"I don't know what's going to happen in the future, and at the moment I don't care because I'm not thinking about it," said Button.