She may be the brains (and brawn) behind the Jillian Michaels 30-Day Shred, but one thing the fitness guru won't be getting rid of any time soon? Her new engagement ring from fiancé Heidi Rhoades. Forgoing the traditional solitaire diamond, the star of "Just Jillian" is sporting what looks to be a sleek, emerald-cut eternity band. Safe to say, there's no "Biggest Loser" around here.