Is a shirtless shot of Geri Halliwell what you want ... what you really, really want?

If so, then you're in luck.

The 40-year-old Spice Girl posted a racy shot on her Twitter page last night -- showing her in the recording studio in only a bra!

Apparently it was so "hot in studio" that she just had to take her top off. Whatever works!

But wow, how good does she look? That's one hot mama right there.

At 40, Geri looks just as good now as she did in her girl group heyday -- but how well have the rest of the ladies aged?

Check out the gallery above to see what all the female singers of the "TRL" generation look like now!

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