London fifth-graders sang All I Want for Christmas is You after Melania Trump added to their merriment by joining them to make wreaths and ornaments at a Salvation Army centre.
At the facility in the Clapton neighborhood of east London, Mrs Trump helped attach pine cones to a wreath covered in yellow tinsel.
She also helped US Marines put gifts into holiday-themed bags.
The first lady nodded in apparent enjoyment as the pupils serenaded her, then clapped and appeared to say "bravo" when they finished the song.
Mrs Trump also donated presents for the charity's holiday drive, including white baseball caps, white Frisbees and soccer balls all stamped with the logo of her "Be Best" youth initiative.
She gave the kids "Be Best" ornaments as gifts before she departed.
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