The "Keeping Up With The Kardashians" star shared a photo of herself in a revealing black swimsuit on her Instagram account.
She captioned the image, "Behind the scenes. (yes I gained weight there I said it so you don't have too). (sic)," she wrote.
However, the 17-year-old star quickly changed her mind about the admission and edited the caption to simply read: "behind the scenes".
Jenner's decision to be open about her figure comes just a couple of weeks after Selena Gomez fell victim to online bullies who taunted her about her alleged weight gain after she posted a picture of herself in a similar revealing swimsuit online.