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Donald Trump Jr., Vanessa Trump, Donald Trump

Bobby Bank/WireImage.com; Jason Merritt/Getty Images

Donald Trump is a grandfather again.

Donald Trump Jr., and his model wife, Vanessa, celebrated the arrival of the couple's fourth baby on Sunday, the real estate mogul's son and fellow Apprentice star announced on Twitter.

"It's a BOY!!! Vanessa and baby are doing great," Trump Jr. tweeted.

No word yet on a name or measurements for the little guy. But the latest addition to the Trump clan joins sister Kai, 5, and older brothers Donald Trump III, 3, and Tristan, 1.

Congrats to the proud parents!