Rethabile said the move was a dream come true.
"I am very excited and very grateful. I have been in the industry for some time now but I have been underground. You know so many doors have been shut in my face but this makes it worth it. I am really blessed and honoured to be part of the (Afrotainment) family."
As the daughter of musician Winnie Khumalo, Rethabile has always been close to the music industry and ma said she was over the moon at what her daughter had accomplished so far.
"She has worked very hard from Idols till now and it is starting to pay off. She is talented and Tira has seen that. He has one of the best eyes for talent in South Africa and the things he has accomplished with his artists are incredible. I am so proud of her," Winnie told TshisaLIVE.