Nico Rosberg has confirmed his move to championship winning Mercedes Grand Prix, the recently re-badged Brawn Grand Prix.
The 24-year-old becomes the first driver confirmed for the 2010 season for the team.
"I am really happy to be a part of the Silver Arrows re-launch in 2010 as a driver for Mercedes," said Rosberg, who spent the past four seasons with Williams Grand Prix.
"No other brand in Formula 1 can look back on such a long and successful tradition in motor racing. I am very proud that I will now drive for the new Mercedes team and work with Ross Brawn.
"I am more motivated than ever and can hardly wait to start testing with the new Silver Arrow and for the first race of the new season at Bahrain in March."
Brawn, who turned the former Honda-backed team into world champions this past season, says Rosberg is the right driver for the new team.
"Nico is a great talent, and with four years of experience in Formula 1, is a driver who will be able to make a valuable contribution to our team right from the outset," he said.
"I had the pleasure of working with his father Keke during his Formula One career and it is great to see Nico following in his footsteps.
"2009 was Nico's best season in Formula 1 to date and we look forward to seeing his development continue with us at Mercedes next year."
Mercedes Grand Prix will have a totally new lineup in 2010 as both Rubens Barrichello and world champion Jenson Button have left the team.
No word on who will be Rosberg's teammate next season with BMW-Sauber pilot and fellow German Nick Heidfeld being tipped as the likely candidate. However, there have been strong whispers recently that Michael Schumacher may make a return to the sport with Mercedes.