London, May 4 : Welsh mezzo-soprano Katherine Jenkins has revealed that she was recently called to sing as a surprise guest at singer Barbra Streisand's birthday bash.

Jenkins, 28, was invited to attend Streisand's recent 67th birthday bash, just hours after touching down in Los Angeles.

"I got invited on the spur of the moment," the Daily Express quoted her as saying.

"I had jet lag and thought I would have an early night. When the call came, of course I said yes," she said.

When she arrived, it soon became clear that she would be expected to perform.

"I went to this house in Bel Air where one of her friends was throwing her a private soirée and everyone was there from Warren Beatty to Hugh Jackman," she recalled.

"All of a sudden her friend said to me: `You really should sing something for Barbra's birthday'," she said.

A somewhat flustered Jenkins hastily decided on the opera aria O Mio Babbino Caro, followed by Happy Birthday.

"I couldn't believe it happened. How nerve-racking was that? She told me I had a lovely voice," she added. (ANI)