Opera singer Deborah Voigt, who was sacked from a London production last year for being overweight, has undergone gastric bypass surgery.
Voigt was dropped from the Royal Opera House's Ariadne auf Naxos
Voigt told the New York Times she lost 45kg (100lbs) following the operation last June.
She was fired from the Royal Opera House's Ariadne auf Naxos in March 2004 because it was felt she would not suit her costume.
Her spokesman said surgery had taken place, but did not discuss details.
Voigt, 44, has since had positive reviews of her performances, and told the New York Times she wanted to go public with the news because she was constantly being asked about her new look.
"I felt it was time to talk about it," she said. "I didn't want to be dishonest."
"I really still think of myself as a very big woman," she added.
"My mind hasn't had the opportunity to catch up with the progress my body has made in a short amount of time."
The procedure creates a small pouch out of the top of the stomach, which is connected to half of the small intestine.
Voigt, who now wears size 14 clothes, called it a "blessing".
She is now preparing for series of New York performances, as she sings the role of Amelia in the Metropolitan Opera's revival of Verdi's Ballo in Maschera.