The new baby will be the fifth grandchild for Trump Jr.'s father, The Celebrity Apprentice star Donald Trump.
Trump Jr. and his wife are already the parents of three children -- Kai Madison, a five-year-old daughter, who was born in May 2007; Donald Trump III, a three-year-old son whom Vanessa gave birth to in February 2009; and a six-month-old son named Tristan Milos Trump, who was born on October 2 of last year.
Trump Jr.'s sister and fellow The Celebrity Apprentice advisor Ivanka Trump and her husband Jared Kushner have one child together, as they welcomed a baby girl into the world in July 2011.
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