Gilbert Flores/Variety via Getty Images Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more! There's a reason some celebrities always look extra radiant on the red carpet - it's not just makeup, it's what they use underneath it. And when someone with consistently glowing, camera-ready skin shares a go-to, it's worth paying attention. That's exactly the case with Kelly Ripa, who relies on a $19 drugstore serum to keep her complexion looking smooth and youthful.