WWE Star Stephanie McMahon -- I Had Three Kids ... AND I'M RIPPED

WWE Vice President Stephanie McMahon is 36 years old ... a mother of three ... and she's more beefed up than Outback Steakhouse.

Stephanie usually keeps her physique hidden beneath a trademark business suit -- but TMZ has obtained these pics from an upcoming photo shoot for RxMuscle.com, finally revealing the Billion Dollar Princess in all her muscular glory.

As for what keeps her in shape -- Steph is a scary good boxer ... and obviously eats really well (under the tutelage of bodybuilding legend and diet guru Dave Palumbo).