It’s been 20 years since How to Lose a Guy in Ten Days was released, cementing the cast as rom-com royalty. They’re all still thriving, and while Mathew McConaughey revealed his big secret that a fortune teller convinced him to do the pic, the secret we’re celebrating is from his radiant costar Kate Hudson: She swears by Egyptian Magic All Purpose Skin Cream, and it’s on sale right now for $32 (was $39). On Watch What Happens Live! with Andy Cohen, Cohen asked her to name the one beauty product that she swears by. “Egyptian Magic,” she told the host. “It’s like a balm that you can put on your…