STOCK FOOTAGE

and confirmed they’ll be teaming up for the massive show next summer, minus and who so far have declined to take part.

“GEM may not have Posh and Sporty, but the commercial opportunities for the girls is still huge,” says our insider, who says global conglomerates eager to latch onto a “nostalgia comeback” create massive endorsement and sponsorship potential. “Banks and credit card companies will splash a million a go to be a lesser sponsor but still have VIP hospitality areas.

The girls can expect to rake in make $21 million in sponsorship and endorsement deals, says our source. They also stand to spice up their savings accounts with $6.5 million in ticket sales and meet and greets and another $5.25 million in pay-per-view and ondemand deals. The “2 Become 1” singers could pull in an additional $5 million for a TV documentary and live CD and DVD sales.

And that’s all without setting foot in the U.S. The girls had been offered a Las Vegas residency, but only with the full five-woman lineup. “However if GEM get momentum then they are sure to be offered something here,” says our insider.

Of course the cash avalanche could gather even more force if Mel C. and Posh can be convinced to climb onboard. ”Bad Moms” star called for a temporary trade embargo Thursday — by ringing the closing bell at Nasdaq. She was joined by who co-stars in the movie about suburban moms on a tear, which opened yesterday. Hopefully Kunis’ maternal instincts are more sound in real life than onscreen — she and hubby announced last month that kid no. 2 is on the way.