"Well, Vanessa & I have some good news we are expecting baby number four in the fall!!!," Trump posted on Twitter.
Trump, 34, married Hayden in 2005 and have three children, Kai, 5, son Donald III, 3, and Tristan Milos, reported US magazine.
Trump married fashion model Haydon at his father's Mar-a-Lago resort in Palm Beach, Floria in 2005. PTI CORR NDS AGL