Becoming a father has changed Ricky Martin from a secretive and closeted gay man to an out and proud father bursting with love for his 2-year-old twins, Valentino and Matteo. Yet, he remains a very private man.

"I have never seen Ricky so happy as when he is with his sons," a close friend of the singer told PopEater shortly before the crooner launched his 'Musica + Sexo' world tour in Puerto Rico on Friday. "Something about their birth and the happiness and fulfillment they have brought him made him want to be honest with himself and with his fans. But he will always be a private person -- it's in his blood."