Beyonce showed off her rocking post-baby body at Michelle Obama's fundraiser for the president's re-election campaign on Monday night in NYC.

Just 10 weeks after giving birth to baby Blue Ivy, the "Irreplaceable" singer, 30, donned a navy curve-hugging, sophisticated dress by designer Victoria Beckham.

Of course, it sounds like she had a little help! According to sources, trainer Marco Borges lived with her for two-a-day workouts at 5 a.m. and 5 p.m. B has also been "living on protein shakes, egg-white omelets, pineapple chunks, and lots of ice-cold water" to "have a better body than ever."