10:50 AM PT -- Former President Barack Obama's also honoring the late Prince with a beautiful tribute, detailing his first encounter with him and the Queen.
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Obama says, "Prince Philip in particular was kind and warm, with a sharp wit and unfailing good humor," adding that throughout the years he "showed the world what it meant to be a supportive husband to a powerful woman."
As we reported ... Buckingham Palace released a statement from The Queen announcing Prince Philip's death, and that was it from the Royal Family until the Archewell post.
It's still unclear what Prince Harry and Meghan's plans are now, but there are reports that at least Harry will be heading to the UK for his grandfather's funeral ... setting up what could be an awkward family reunion.