John Stamos and Fiancée Show Off Her Rock, Have Mercy!

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John Stamos and new fiancée Caitlin McHugh wasted no time hitting up a public event to reveal the sparking engagement ring.

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The “Fuller House” star and fiancée were out Tuesday at the Elizabeth Taylor AIDS Foundation and Mothers2Mothers benefit dinner in Beverly Hills.

The couple announced the engagement on Monday after Uncle Jesse proposed at Disneyland.