"Harry" teased a special project he's working on with the singer for his Invictus Games in an Instagram post.
Thousands of people have turned out to catch a glimpse of the couple on their first public appearances since the announcement they are expecting a child.
The former president looked happy to meet the young royal again.
Melania Trump will travel to Toronto in September for the next Invictus Games. Is the jovial trash talk optional?
"Careful what you wish for," the president said. The prince responded, "You can dish it out, but can you take it?"