Kourtney, 35, has seemingly always sprung back into her pre-pregnancy figure, but insiders have revealed that even she's shocked with her progress this time around.
The Keeping Up With The Kardashians star welcomed son Reign Aston six months ago and has allegedly dropped 35 pounds in five months – and it's apparently all down to exercise and a special tea.
A source told Life & Style: "She jumped on the the treadmill and lifted weights to get toned. And she drank a special kind of tea.
"It clears the body of toxins and gives her energy to work out."
The tea in question is Lyfe Tea Teatox – and Kourtney's been raving about it on Instagram.
The source continued: "Kourtney's never lost the baby weight this quickly before. She's ecstatic. She's pretty much at her goal weight. She says third time – or baby – was the charm."
Kourtney and her long-term partner Scott Disick, 32, are also parents to son Mason and daughter Penelope.