Well, they are Hollywood royalty, so fair enough, I guess.

Angelina Jolie and Brad Pitt were at Kensington Palace last night as they arrived in London to promote her new film, Maleficent.
There is currently an exhibit showcasing costumes and props from the film, in which Jolie plays an eponymous fairy, going on in the public part of the palace.
Angelina and Brad were at the premiere in Leicester Square earlier.