Nico Rosberg will remain at Mercedes for the foreseeable future after signing a new "multi-year contract extension".
The 29-year-old joined the Brackley-based squad from Williams at the start of the 2010 season and has proven to be a massive success for the team.
First he got the better of Michael Schumacher during their few years as team-mates and this season he is giving Lewis Hamilton a big run for his money for the Drivers' title.
He has already won three races this campaign and leads the Championship by four points from Hamilton.
"I am very proud to drive the Formula 1 Silver Arrow of the modern era," Rosberg said.
"As a German, the heritage of Mercedes-Benz is very special for me, and I am proud to be able to represent the best car brand around the world.
"It has been a difficult road to get to where we are now - but everybody kept believing and, thanks to the fantastic support from Mercedes-Benz, we are now leading the way in F1.
"I'm looking forward to the next years together, when we will keep pushing to win even more races - and, hopefully, championships."
In total Rosberg has already won six races for Mercedes with his first coming in Shanghai in 2012.
Mercedes head of motorsport Toto Wolff added: "Nico has been part of the Silver Arrows project since day one and he has a big stake in the development of the team since 2010. His speed, commitment and focus have all helped to give clear direction and to drive the team forward.
"With his performances in 2014, Nico has demonstrated to the outside world what we knew already in the team: that he is one of the very top drivers in Formula 1.
"This new contract brings us important stability and continuity for the future and I am delighted to be able to make the announcement in time for the home race of Mercedes-Benz and Nico in Hockenheim."