The internationally recognised and highly respected South African singer, Yvonne Chaka Chaka has praised Kenyan activist Boniface Mwangi.

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This is after Mwangi was selected in Kenya's Top 40 under 40 men.

The songwriter, entrepreneur, humanitarian and teacher said the young activist was the voice of the voiceless, following his efforts to ensure good governance in Kenya.

The two posted pictures on social media, posing together, after Mwangi called on her, to present her with a copy of his book, BMUnBounded, Thursday.

"Called my South African mum Yvonne Chaka Chaka to present her with a copy of my book #BMUnBounded and she told me lets go somewhere famous and do it. At the age of 20 I was Yvonne's personal photographer everytime she visited Kenya."

"She wrote a beautiful foreword for my book. We posed for this photo on Vilikazi street in Soweto where two Nobel Peace Prize winners share a street, Desmond Tutu and Nelson Mandela,'' Mwangi said.

"Hanging out with my Kenyan son Boniface in Soweto. Boniface has grown to be the voice of the voiceless, the voice of reason #BMUnBounded,'' said the 'Princess of Africa' (a name she received after a 1990 tour).

Chaka Chaka has been at the forefront of South African popular music for 27 years and has been popular in Zimbabwe, Kenya, Gabon, Sierra Leone and Ivory Coast.

She is a champion for the Global Fund to Fight AIDS, TB and Malaria, the United Nations MDG Envoy for Africa, and the Goodwill Ambassador for the Roll Back Malaria Partnership.