Reality star hottie Jenni "JWoww" Farley flaunted her stomach on Instagram over the weekend, and she definitely knows the definition of washboard.

During her workout she snapped a selfie, wearing a sports bra and yoga pants while flexing her amazing midsection. The sweat sessions are definitely paying off for the "Snooki & JWOWW" star, who poses without make-up.

Her fiance Roger Mathews joked about her diet habits on Twitter, writing: "Looking good babe. Remember only 2 raisins for breakfast and a thimble of water. For lunch u can have a rice cake and pine needles."

We're not sure what her workout and diet regimens are, but she's definitely doing something right.