"The four of us snuck out in Halloween costumes to just have ... world that we were a couple," explained Meghan, who announced her engagement to Prince Harry on Nov. 27, 2017.

"The four of us snuck out in Halloween costumes to just have ... that we were a couple," explained Meghan, who eventually announced her engagement to Prince Harry on Nov. 27, 2017.

The cousins and their partners dressed up in Halloween costumes for a final night out before their relationship was revealed on the Ellen DeGeneres show. Meghan and Harry have also reportedly ...

Professor McGonagall's costume from Harry Potter and the Half-Blood Prince, as worn most famously by Dame Maggie Smith, has been added to the experience and is now on display in the exhibition's ...