Geri is to pick up a $950,000 (GBP500,000) cheque for escorting billionaire playboy Dickie Lugner to this year's Vienna Opera Ball.
Geri will follow in the footsteps of Pamela Anderson, Sarah Ferguson and Sophia Loren, who have also partnered the 72-year-old to the annual Austrian society event.
Lugner enthuses, "I chose Geri because of her wonderful smile. I'm delighted to have such a star guest as Ginger Spice, who has made such a successful name for herself."
Halliwell and Lugner will party with the cream of European society on 3 February.
Source: Contact Music