Page Six may be compensated and/or receive an affiliate commission if you buy through our links. When it comes to scoring once-a-year discounts, Cyber Monday is, well, a thing of beauty. And with the shopping Super Bowl already well underway, ’tis the season to stock up on beauty, skincare and haircare must-haves from top brands. In addition to deals on celebrity-owned labels — including Fenty Beauty — sales across the internet are also filled with plenty of celebrity-approved items. From the lash serum Brooke Shields swears by to the coconut melt Kourtney Kardashian uses to look good naked, now’s the prime time to stock up on a bevy of beauty…