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The La Vida Loca singer - who has 2-year-old twin sons Matteo and Valentino, through a surrogate mother - plans to expand his family further once he has completed a stint in Evita on New York's Broadway in 2012.
He said: "I'd like a daddy's girl.
"I'll be steady in New York, and then, after I do the play, the baby will be born and I'm going to be able to spend time with her."
Martin has been in a relationship for four years, which he admits he never expected to happen, and is hopeful of marrying one day, but only when it is legalised in his home country of Puerto Rico.
He told the Guardian newspaper: "That was not in my plans - not part of the schedule! His name is Carlos, and he's an amazing human being. He works with the other side of the brain, because he's a financial adviser, a stockbroker.
"Whenever it's time, I would love the option to marry in my land, my island, but unfortunately it's not an option yet, which I think is ridiculous.
"But it's part of a very beautiful process that's happening round the world little by little. Hopefully I will see it and my kids will see it."
