Singer Kylie Minogue has had a cancerous lump removed from her breast in what doctors described as successful surgery, at a Melbourne hospital.
"Her spirits are high and she's feeling fine," said surgeon Jenny Senior, who described her as the "perfect patient".
The operation was carried out at the St Frances Xavier Cabrini Hospital.
The Australian singer's announcement on Tuesday that she had been diagnosed with breast cancer attracted sympathy from her many fans around the world.
"I am very pleased to be able to confirm that the operation was successful," said Dr Senior, who performed the operation on Friday afternoon.
"I feel confident that we caught the cancer in time and that she is now on the road to complete recovery," said the surgeon, who passed on the singer's thanks to all her friends and supporters.
The 36-year-old singer, who had to cancel the Australian leg of her "Showgirl" world tour to undergo urgent treatment, is said to be surrounded by her closest family as well as French actor boyfriend Olivier Martinez.
Minogue's UK spokesman Murray Chalmers said he could give no details of how the singer's treatment would progress, or say what kind of surgery she had undergone. But he said the singer was in "very good spirits".
Minogue cancelled Australian tour dates and a Glastonbury concert
Dr Sarah Rawlings, head of policy at the charity Breakthrough Breast Cancer, said: "Our thoughts and best wishes are with Kylie at this time. We are pleased to hear the surgery appears to have been successful."
Minogue, who has had 29 Top 10 hits in the UK since her 1988 number one I Should Be So Lucky, has sold an estimated 40m records.
Fans of the singer are said to have donated 8,000 Australian dollars (£3,300) to a specially-created Kylie Minogue Breast Cancer Fund in its first 24 hours.
Breast cancer is the primary cause of cancer death among Australian women, and second only to lung cancer in the US and UK.