Serena Williams showed her Instagram followers what a natural post-partum body looks like as she tried on a denim skirt she bought while pregnant. Fans praised the athlete for showing her natural body and not masking what baby weight looked like after giving birth. Serena Williams is a mom of two and candidly sharing her body post-partum. The tennis star recently shared a video of herself trying to fit into a denim Valentino skirt, which, unfortunately, couldn’t make it past her glutes. Williams bought the skirt when she was pregnant and thought she would fit in it when she lost her belly. How…