The pop star shared this photo of herself wearing only a sports bra and leggings with the caption, "ACDC and Pilates equals I will knock you out b**ch. TNT, I'm dynamite."
There had been some speculation that Mother Monster had an itty bitty baby bump, but we're pretty sure this super slim photo of the pop star will put those rumors to rest.
The "Applause" singer also yoga and has been spotted at SoulCycle classes. She even bought two SoulCycle bikes (at $2,200 apiece) to take with her on her "Born This Way Ball" tour. We can't even imagine how she had the energy to spin in between concerts, especially because SoulCycle is such a killer workout, but good for Gaga for sticking to her fitness routine!
To see how some of your other favorite stars get their sweat on, check out the gallery below.
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Gallery | Sweating With the Stars