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P!nk got her pre-baby bod back -- after dropping 55 lbs.!

The singer flaunts her terrifically tight tummy on the November cover of Shape Magazine, wearing little more than black underwear and a smile.

The revealing cover comes a little over a year after P!nk gave birth to her first child with husband Carey Hart, adorable daughter Willow.

So ... how'd she do it?

The new mom recently told PEOPLE she works out for an hour and a half five days a week -- and has been using Freshology meal deliveries. She's also in rehearsals for her upcoming tour.

"I don't stick to it," she said of her diet. "I drink wine. Every day is a cheat day!"

Check out more stars who bounced back after having a baby in the gallery above!

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