Soon they'll be a party of five!
William's mother died in 1997 in a car crash while fleeing encroaching paparazzi.
Prince Harry has stated that he only learned how to cope with the death of his mother, Princess Diana, after decades of silence before finally opening up to talk about this childhood tragedy.
Lady Gaga had previously opened up about her struggles with mental illness, and how she's learned to deal with them.
'No one should be bullied for their sexuality or any other reason and no one should have to put up with the kind of hate,' he told the magazine.