Chaz Bono was surprised on a recent appearance of the Ellen Degeneres talk show after his mum Cher called in to say hello.
The transgender star was promoting his upcoming stint on Dancing with the Stars when Ellen interrupted him with a phone call.
Degeneres, who came out as a lesbian on TV, cooed about how proud she was of Bono and Cher agreed.
The pop superstar said: "Chaz and I actually talked about this (sex change) several times over the years and then nothing happened. And in one way I thought, 'Oh God, this is going to be so terrible. He is going to have to go through so much.'
"(But) the way he’s handled himself... My child is a wonderful child."
She used the phone-in to address reports suggesting fans of the show have threatened to boycott in this season over the idea of a transgender man dancing with a woman.
Cher added: "I don’t know if people are that determined... if you got that excess time and that amount of hostility, I’m not so sure that I can say anything to you that would make you change your feelings.
"Those are such feelings of hostility and fear, that I don’t know that I would have any magic words to make you feel more comfortable and to soothe you into not being terrified of my child dancing on Dancing With The f**king Stars."
Her son ended the phone chat by saying: "Hi mom and thanks for all the support and I’ll give you a call later."
Bono's appearance on the Degeneres' show aired on Wednesday. He'll make his debut on Dancing With The Stars next week.
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