May 02, 2012 09:00 PM

Sara Jaye Weiss/Startraks

The Trump legacy continues to grow.

Donald Trump, Jr. and his wife Vanessa are expecting their fourth child, he announced via Twitter on Wednesday.

“Vanessa & I have some good news. We are expecting baby [number] 4 in the fall!!! Kai, Donnie, and Tristan can’t wait!” Trump, 34, writes.

“They’ll be 13 months apart. Irish twins!”

The couple — who wed in 2005 — are already parents to daughter Kai Madison, 5 next week, and sons Donnie John III, 3, and Tristan Milos, 7 months.

— Anya Leon

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