Trump and her husband Donald Trump Jr, who often appears on The Celebrity Apprentice with his father, announced earlier this week that they are expecting their fourth child.
"We're so excited to add to our family," Vanessa Trump told Us Weekly. "I'm four months along... the baby is due in October."
Trump explained that she does not yet know the sex of her baby but said that she is "feeling really good so far" and has had "an easy pregnancy".
She added that her older children, 5-year-old Kai and 3-year-old Donald III, are "so excited" about the pregnancy as they have helped with their brother, 7-month-old Tristan.
"We're so blessed to be able to have another child to add to our happy, growing family," she said.
The Celebrity Apprentice airs Sundays on NBC.