Barbara Rickles had been hospitalized since last week and passed away on Sunday, on her 56th wedding anniversary to the iconic comedian. The Rickles were married for 52 years before Don's passing in 2017. "Don and Barbara were good old-fashioned Hollywood sweethearts -- and were pretty much partners as Don navigated showbiz in the '60s, '70s and beyond," says TMZ. "Barbara served as an EP for a re-release of a comedy show of Don's called 'Don Rickles Live in Concert.' She also appeared alongside him as herself in documentaries and other TV specials over the years." John Stamos paid tribute to Barbara Rickles, writing on Instagram: "If you asked Barbara Rickles how she was doing, she would never just say, 'I’m fine.' She would always say, 'We’re fine.' Don and Barbara were like one."