Despite the 'Hair' hitmaker grossing an estimated $125 million from her huge 200-performance show at one point the production had cost her so much to stage – with its elaborate costumes and backing dancers – she had spent more money than had been earned.
She told the Financial Times newspaper: "I put everything in the show, and I actually went bankrupt after the first extension of the 'Monster Ball'. And it was funny because I didn't know! And I remember I called everybody and said, 'Why is everyone saying I have no money? This is ridiculous, I have five number one singles' - and they said, 'Well, you're $3 million in debt.' "
However, Gaga hasn't curbed her spending since her tour and reportedly recently sent minders to buy memorabilia from London of the British royal family to decorate her home with and remind her of her fans in England.
A source told the Daily Mirror newspaper: "Gaga has sent her staff to London to spend £10,000 on Princess Diana and Prince William and Kate Middleton wedding memorabilia. She wants to set up a room in her New York apartment dedicated to London and all her precious Little Monsters over there.”
In addition to her extravagancies, the 'Judas' singer has also been looking after her parents with her riches.
She said: "The only big things I've purchased are my dad's heart valve and a Rolls-Royce for my parents, for their anniversary. And that was only because my dad had a Lady Gaga licence plate on our old car and it was making me crazy because he was getting followed everywhere, so I bought him a new car."