From red carpets to date nights with George, Amal Clooney's glow never goes unnoticed. It always looks impossibly flawless, luminous and ageless - and fans have been dying to know her beauty secret. Turns out, it may be thanks to this popular $30 serum that shoppers say makes them "feel 20 years younger." Enter: Charlotte Tilbury's Magic Serum Crystal Elixir, a radiance-boosting formula crafted to smooth, lift and bring life back to tired skin. The serum is a favorite among celebrities, supermodels and makeup artists who use it to get that signature, lit-from-within glow.