Gaga 'doing great' after hip surgery

New York - Lady Gaga's manager says the pop star is "doing unbelievable" a month after she had hip surgery that caused her to cancel her US tour.

Vincent Herbert said in an interview on Tuesday the 26-year-old Grammy winner is "doing wonderful, doing great".

Gaga, whose real name is Stefani Germanotta, cancelled her "Born This Way Ball" tour last month. She had hurt herself while performing some time ago.

Herbert says Gaga is finishing her new album, "ARTPOP", and is "ready to get back to work".

He calls the new album "very, very refreshing" and says the "Born This Way" singer continues to "push the envelope".