Peering out from under a giant pink hat, Perry strode among the pews of the abbey looking for her spot among the gathered guests. At one point, she appeared to ask others for guidance.
Perry is due to perform at the Coronation Concert on Sunday evening. Other musical acts will include Lionel Richie and Take That.
Other star guests at the Westminster Abbey service included Emma Thompson, Judi Dench, and Maggie Smith.
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