Lewis Hamilton cheered on by Lindsey Vonn during Formula One testing session

One of the fastest skiers turned up to support one of the fastest Formula One drivers as Lindsey Vonn cheered on Lewis Hamilton during another day of testing.

Despite having to hobble around on crutches due to a knee injury sustained at the World Cup, Vonn was in Barcelona to meet up with her close friend. 

It is not the first time Vonn has attended a Formula One event to meet up with the Mercedes driver as the American alpine ski racer was at Silverstone in July to attend Hamilton's home race.

Lewis Hamilton (left) speaks to his friend Lindsey Vonn (right) on day two of Formula One winter testing 

Vonn, whose season has ended early due to injury,  at Formula One pre-season testing on Wednesday

Hamilton looks in high spirits as he takes a breather from Formula One testing on Wednesday

American alpine ski racer Vonn previously cheered on Hamilton during the British Grand Prix on July 5 

Vonn (left) and Hamilton (right) speak on the grid before last season's Grand Prix race at Silverstone 

Hamilton and his Formula One colleagues will practise again on Friday in the final allotted day of pre-season testing.

He will then turn his attention to the first race of the Formula One calendar which begins in Melbourne, Australia on March 20. 

The 31-year-old three-time world champion will have put a ring around July 10 in his diary as he will return to England to race in front of his home crowd at Silverstone. 

Hamilton said of the upcoming campaign: 'Everyone naturally is going to hype us up, every single person is going to hype us up, but you really don't know what fuel load Ferrari are on.

'I think they have got a strong package, even Williams look like they have got quite a strong package, so I would not take any notice of what they are saying to be honest.'

Vonn, on the other hand, is expected to be on the sidelines for a while after suffering yet another injury setback while competing in Andorra on Saturday. 

Scans revealed she had suffered a triple fracture to her tibial plateau and Vonn has taken the decision to end her campaign despite racing on Sunday with a knee brace.

'When I crashed on Saturday in Andorra, I fractured my tibial plateau,' the skier, Tiger Woods' former girlfriend, explained of that fall in a Super-G race that damaged her left knee.

'The traditional X-rays that were taken that afternoon showed a hairline fracture, but the tibial plateau appeared to be stable and did not pose significant risk to competing. So I raced on Sunday.

'With the World Championships in St. Moritz next year and the Winter Olympics in South Korea the following year, I cannot take that risk.' 

Vonn has revealed her World Cup season is over after fracturing her knee in a crash

Vonn still leads the World Cup standings but has had to make one of the toughest decisions of her career

Vonn lost her footing on Saturday. A trail of snow follows Vonn before she comes to a halt following the crash at the World Cup, pictured left. She lays on the ground, pictured right

Tiger Woods' former girlfriend was carried off the slope on a rescue sled after receiving treatment