Before the start of this morning's first day of testing at Valencia, world champion Sebastian Vettel and teammate Mark Webber pulled back the covers to reveal the car with which they will contest the 2011 season.

The unveiling was followed by a press conference in the team's Energy Station with the two drivers, team principal Christian Horner and chief technical officer Adrian Newey. The RB7 completed its first lap of the circuit when testing began.

It's just 11 weeks since Sebastian Vettel drove to victory in Abu Dhabi and less than six weeks before the car will contest the Bahrain Grand Prix. This morning was the culmination of months of hard work in Milton Keynes, where every department has been focused on increasing the silverware in the Red Bull trophy cabinets.

"It's a great feeling to arrive here and roll out the car with the number one on it as the reigning World Champions," said Christian Horner, "but now the challenge is to keep it. The team's been very focused on RB7 over the last few months; Adrian didn't release his drawings any earlier than normal, so the whole design group and production team have done a remarkable job to produce this car in the shortest possible time. It's a long season, the longest in F1 history, and we have some great opponents, but we are very motivated and will be working hard to hold on to the two world titles. I'm sure it's going to be a fascinating battle."

"It's always a special moment when a car runs for the first time," added Adrian Newey. "The big challenge for us this year was the reintroduction of the KERS system. It's always a challenge to find solutions, which don't compromise the aerodynamics of the car. This season, with McLaren, Ferrari and Mercedes all having KERS, we need to get it to work, simply for performance off the line."

The reigning champions welcome several new partners for 2011, as well as reconfirming continuing and enhanced agreements with many of its existing partners, its partner portfolio now includes: Total, Rauch, Pepe Jeans, Casio, Singha Beer, FXDD, Geox, Pirelli, Alpinestars, Platform Computing and Siemens.

To check out the first pictures of the RB7, click here.