Former Mad Men actor Jared Harris is engaged to Allegra Riggio, and he proposed with a very unique-looking ring. Allegra posted a Vine video of the engagement ring, designed by Erica Courtney, which has a heart-shaped diamond. As we saw with Kate Middleton's sapphire stunner, sometimes the unique celebrity rings can inspire new trends — so maybe heart-shaped rings will be the next big thing. I have to admit, it harkens back to my younger days getting jewelry from those toy vending machines at the grocery store . . . in a good way. What do you think of the unusually designed sparkler?