Prince George delighted viewers watching the Platinum Jubilee celebrations outside Buckingham Palace on Saturday night when he was shown on camera singing along to a Neil Diamond classic.

Among the performers at the “Party at the Palace” was Rod Stewart, who led the crowd in a singalong of “Sweet Caroline.”

At one point, the camera cut to Prince George singing along to the chorus, seated next to dad Prince William as both waved Union Jack flags and sang together (the moment can be seen in the video above, just after the 4:30 mark).

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While the prince’s appearance onscreen may have been brief, it proved to be a hit with viewers, who took to Twitter to chime in about the adorable moment.