' daughter Phoebe has officially confirmed that she is dating 's grandson Arthur Donald.The 21-year-old, whose founder father is worth a staggering $134 billion, was spotted celebrating her Stanford graduation alongside her new beau - eight months after first becoming engulfed romance rumors.DailyMail.com previously reported that - but Phoebe has now openly referred to Arthur, 25, as her 'boyfriend' while documenting her education milestone in an online blog for .
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