F1 champion Jenson button will move to McLaren, racing alongside fellow Brit Lewis Hamilton
Button won the Formula One Championship this year with the Brawn GP team.
The English team now features the two most recent title holders, in Button and Hamilton.
McLaren said Button joined on a "multiyear deal" after leaving constructors champion Brawn GP in the wake of its takeover by Mercedes-Benz earlier this week.
The 29-year-old Button, who is replacing Heikki Kovalainen, was out of contract with Brawn GP.
“It’s always a difficult decision to leave a team when you’ve been there for so long. But life is all about challenges – and, most important of all, it’s about challenging yourself. So, although I won the World Championship with Brawn GP last year, and I’ll never forget that, I was always adamant that I wanted to continue to set myself fresh challenges," Button says.
Button's move to McLaren ends his seven-year association with the team, which he joined in 2003 when it was known as BAR before establishing himself as the team's No. 1 driver prior to Honda's takeover in 2006.
Lewis Hamilton said in a statement: "It’s fantastic news that Jenson has decided to join Vodafone McLaren Mercedes – and I’m looking forward to working with him and our engineers to make sure we kick off the 2010 season with a car that’s competitive enough to win the World Championship."