The singer, real name Stefani Germanotta, performed for Her Majesty at the Royal Variety Performance at Blackpool's Opera House.
Lady Gaga, 23, took to the stage in a Tudor-style gown, complete with puffed sleeves and an Elizabethan ruff.
She went on to perform hit track Speechless while suspended in mid-air in front of a giant piano on stilts.
Other performers at the Royal Variety Performance included Alexandra Burke, Katherine Jenkins, Whoopi Goldberg and Britain's Got Talent winners Diversity.
See more Lady Gaga photos from the night here
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