It was also pretty hard not to notice Prince Harry sitting a few rows behind the rest of his family.
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Speaking of unwelcome guests, the GRIM REAPER appeared at Westminster Abbey.
Katy was more in her element on Sunday when she performed at the coronation concert with Lionel Richie, Andrea Bocelli, Steve Winwood, Nicole Scherzinger, and the British group Take That.
One last quick note: Katy and Lionel appeared on "American Idol" last night from London . . . and they had the King and Queen with them.
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