"She said she was just going out to get some milk..." he joked with a re-tweet of the Kensington Palace announcement.
He followed up with a touching tribute to his friend, and warm words for Prince Harry.
"Playing Meghan’s television partner for the better part of a decade uniquely qualifies me to say this: Your Royal Highness, you are a lucky man and I know your long life together will be joyful, productive and hilarious," he wrote. "Meghan, so happy for you, friend. Much love."