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Donald Trump is set to become a grandfather again - his son Donald, Jr. is expecting his fifth child.

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The businessman, who has appeared on his dad's reality TV show "The Apprentice," and his wife Vanessa announced the news on Twitter on Tuesday.

They wrote, "Kai, D3, T-man, Spencer & I have some exciting news... We are expecting baby #5 this summer. Can't wait."

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Trump, Jr. is the Trump Organization's Executive Vice President of Development and Acquisitions.

He and Vanessa have a six year old called Kai Madison, and three other kids, aged from 15 months to four.

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Trump, Jr. and his wife wed in 2005.