The singer, 52, beamed as she joined fellow celebrities at the lavish event at The Park Restaurant in London on Friday. She completed the outfit with some white heels.
The girl-group are understood to be considering a reunion of their own, six years after they filled stadiums across the United Kingdom with their Spice World mini-tour.
The Spice Girl, 52, best known as Ginger Spice, has been applauded for her second book in her Rosie Frost series, with customer reviews averaging four stars.
EXCLUSIVE: The Spice Girl, who is married to Red Bull F1 boss Christian Horner, has been involved in a pitch to make a programme which would follow her life.