Matthew Mcconaughey has got his girlfriend PENELOPE CRUZ so hooked on roadtrips across America, she's applying for her driver's license so she can get behind the wheel.

Free-spirited McConaughey treated the Spanish actress to her first proper US roadtrip last year (05), when he took her travelling in his beloved Airstream trailer - and now she can't wait for their next adventure.

The movie hunk says, "She gets the simplicity of this tribe (travellers)."

But Cruz refuses to rough it, like McConaughey is often forced to: "If it's winter, I'd better make damn sure the heat is working."