The eccentric singer marked the end of her 'Monster's Ball' tour on Wednesday (27.04.11) by throwing a huge bash inspired by today's (29.04.11) nuptials between Prince William and Kate Middleton for her friends, family and crew in Cleveland, Ohio.
According to insiders, the 'Judas' singer decorated the venue with Union Jack bunting and served her guests ' including her mother Cynthia - traditional English fare such as cucumber sandwiches, coronation chicken and crumpets with jam, with gin cocktails served in royal mugs.
A source told the Daily Mirror newspaper: 'Gaga had the time of her life ' on occasion she was even talking in a London accent.
'Her attention to detail was impressive. She had a special room decorated backstage in British flags and bunting and everyone was told to work the royal look.'
Gaga, 25, dressed up as William's great-grandmother, the late Queen Mother, in what was described as a 'unique interpretation' of the royal, while her entourage were also creative in their costumes.
The source added: 'Her dancers came dressed as Wills and Harry, Henry VIII and even corgis, like the Queen's dogs.'