A source has revealed that the gowns created by the designer will be eye-catching and will make each of the Spice Girls stand out.
"The gowns will be stunning. They want to create a fabulous show and will certainly look the part in Roberto's creations," the Sun quoted the source, as saying.
"I would expect rhinestones to be dripping off the dresses so they will look spectacular with the lights sparkling off them. Cavalli is a fabulous designer - he will make each girl look sensational in their own way," the source said.
Posh, a long-time friend of the Italian designer sealed the deal after she flew from Los Angeles to be at the opening of Cavalli's new store in Paris.