via Shenanigans
However, it's no big deal, the Palace says.
“It’s obvious that it was a mutual sign of affection and appreciated between the Queen and Michelle Obama,” a spokesperson for the Queen told "Inside Edition."
“There is no offense. The reception was an informal occasion. There's no breach of protocol.”
And the advice from Buckingham Palace for future encounters? “The only recommendation is that you do what you would naturally feel in that environment.”