Shakira and Her Abs Rock World Cup Closer

The fireworks in Johannesburg last night weren't the only thing lighting up Soccer City Stadium -- check out Shakira's glow-in-the-dark dress!

Shaki rocked a sexy, custom made, Roberto Cavalli two-piece while performing "Waka Waka" -- the official song of the soccer tournament.

We're loving the vibrant look -- and how it highlights her killer abs.

Check out all the wild fashion shots!