Billionaire Robert Kraft was seen exercising with his younger fiancée as the annual Sun Valley billionaires conference began - with scandal-hit former Facebook boss Cheryl Sandberg also spotted arriving.The New England Patriots' owner, 80, was snapped smiling while out for a walk with ophthalmologist girlfriend Doctor Dana Blumberg, 47. Kraft and Blumberg announced their engagement in March, just over a decade after his wife Myra died of ovarian cancer.
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