SCALLOPED NAIL ART TUTORIAL: Cosmopolitan.com partnered with Baileys to create the ultimate girls night out manis and cocktails. Here, a how-to on sexy scalloped nails, thanks to manicurist Madeline Poole. It's way easier than it looks — you just need to know this *one* trick! Click through for the DIY nail art tutorial and everything else you need to know! Find more fun and unique nail art ideas at Cosmopolitan.com.