She’s still got it! Supermodel Elle Macpherson showed off her flat abs and long legs in a recent Instagram post while promoting one of her WelleCo products. In the scenic snap, the 60-year-old was on a boat in a gorgeous location while rocking a black crop top, black bikini bottoms, a matching hat, a gold waist chain and sunglasses. The star shared details on the product she was holding via the caption. “When it comes to beauty, I have always believed that when you’re well within, it shows on your skin,” the Friends alum explained. “Like anyone, I’ve experienced both sides to this coin so when…