The scantily clad model was sure to keep her head warm

 Petra, who once dated James Blunt, shows off her sexy side

She has insisted:" We are friends. He is on the advisory board of my charity."

Petra launched The Happy Hearts Fund for disadvantaged children in 2005 after surviving the Indian Ocean tsunami tragedy - her British photographer fianc Simon Atlee died tragically in the disaster.

She has been single since splitting from James Blunt last year after rumours the singer had a wandering eye, but hopes to settle down and eventually start a family.

She has said: "I definitely want to have children. I've set myself a target of five. I want a man who I can trust. There has to be trust, honesty, respect, freedom and love."