Lewis Hamilton is reportedly joing girlfriend Nicole Scherzinger and her band the Pussycat Dolls on tour.

The race car driver - who has just won the Formula 1 World Championship - reportedly wants to return the favour after Nicole spent hours by the race track cheering him on.

Lewis is said to be joining his pop star girlfriend on the sidelines as the Dolls gear up for their world tour.

An insider tells the Mirror, "Lewis was overwhelmed with the support Nicole has shown him.

"Now he wants to return the favour and join her on tour. They are very much in love.

"It's a sure sign their relationship is getting more and more serious."