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Donald Trump and his wife, Melania Knauss, are expecting their first child together, his rep confirms to PEOPLE.

"They are expecting in the spring," says the spokesperson, adding: "They are very happy."

As for becoming a father again – while this will be his first child with the 35-year-old Melania, he has four other children – Trump, 59, "is loving it," the rep tells PEOPLE. "He's always said he wouldn't mind having more of a family."

The New York-based Apprentice star and real-estate developer has three children by his first wife, Ivana (Donald Jr., 27; Ivanka, 23; and Eric, 21) and a daughter with second wife Marla Maples (Tiffany, 11).

"We want to have a family, yes," Melania, a Yugoslavian-born model, told PEOPLE at the couple's splashy wedding at Trump's Palm Beach estate, Mar-a-Lago, last January.

And as wedding guest and The Insider host Pat O'Brien told the magazine at the reception: "Donald has always said he used to make a bad husband and a great father. He says this time around he wants to make a great father and a great husband."