The Duke of Sussex's appearance came unannounced, but isn't a total shock given the date -- it appears to have been a quick trip, however, and he wasn't seen with any other royal family members while stepping out of the chapel.
His brother Prince William, was in Wales with his wife, Kate Middleton, not long after Harry left Windsor, too. Seems like the royals spread out over the UK to honor the late Queen.
Of course, there's a pretty glaring difference ... the King and William's appearances were public affairs with media present -- they're "working" Senior Royals, after all -- while Harry's visit was off the grid.
They also were having fun at Beyoncé's L.A. concert last weekend, so while they've got a lot happening for them on this side of the pond -- Harry still made time to fly back to pay his respects to the late Queen.