SYDNEY: U2 frontman Bono sent fans into a frenzy when he joined Australian pop princess Kylie Minogue for a duet as he made a surprise appearance at the second concert of her comeback tour.

The Irish rocker, in Sydney for U2’s Vertigo tour, swooped onto stage late on November 12 before a 10,000-strong audience that had turned out to see Minogue return to performing following 18 months of treatment for breast cancer.

The duo stood back-to-back and sang Minogue’s hit Kids to rapturous applause at the Sydney Entertainment Centre.

“Ladies and gentlemen, we are in the company of greatness tonight,” Mino-gue said as she introduced her surprise guest star. “Let me hear it for Bono.”

Minogue, 38, wore a leopard-print cat suit while Bono wore a black suit and his blue sunglasses for what is sure to go down as a red-letter rock day. The pair danced around the stage and Bono got down on his knees, kissed Minogue’s hand and thanked her at the end of the song.

“It’s such an honour for you to sing with me,” Minogue said. “You’re perfect,” Bono responded.