Nestled within her adorable birth announcement after welcoming her son with boyfriend Jason Derulo, was a seriously impressive photo of new mom Jena Frumes. Just 11 days after giving birth to baby Jason King Derulo, Jena’s already back into fighting shape — with abs, no less. Her photo, which you can see below, shows Jena, 27, posing for a mirror selfie wearing just underwear and a crop top with nursing pads peeking out.