Gwen Stefani has amazed her fans with an incredible picture of her checkerboard nails over on Instagram.MORE: Gwen Stefani's $13million mansion with fiancé Blake Shelton has wild interiorsThe What You Waiting For singer seemed to be in a racing mood as the nails fully resembled a checkered flag waved at the end of a race.She even appeared to reference this in the caption, as she added a checkered flag, heart and diamond emojis to the post.WATCH: Gwen Stefani reveals how proposal nearly didn't