Diane von Furstenberg, 77, puts on a smile for the cameras as she enjoys a night out at the theater with billionaire partner Barry Diller - just days after her former sister-in-law Ira died at the age of 83

The 77-year-old Belgian-born fashion designer, who invented and popularized the wrap dress, was snapped walking out of New York's Joyce Theater on Tuesday with Barry, who she wed in 2001.