Jon Batiste is a glass half-full kinda guy. Case in point -- amid his wife, Suleika Jaouad's, second bout with leukemia, the five-time GRAMMY-winning singer is smiling, dancing and counting his blessings thanks to a promising update about her health.The 35-year-old musician spoke with ET's Rachel Smith on Monday night as he arrived on the red carpet for the Met Gala and explained why he feels blessed — and it has everything to do with Jaouad having an incredible couple of weeks.«She's doing great,» Batiste revealed. «This is actually the best two weeks we've had so far.