Donald Trump Jr., wife Vanessa expecting baby No. 5

Donald Trump's empire is expanding. We're not talking business, but family. The mogul's seventh grandchild is on the way.

Donald Trump Jr. and his wife, Vanessa, both 36, are expecting their fifth child. The Apprentice boardroom star and exec in the Trump organization announced the news on Twitter:

"Well @MrsVanessaTrump, Kai, D3, T-man, Spencer & I have some exciting news… We are expecting baby #5 this summer. Can't wait," he wrote, adding, "#evenlesssleep."

Donald Jr. and Vanessa are already parents to Kai Madison, 6; Donald John III, 4; Tristan Milos, 2, and Spencer Frederick, 15 months.

His sister, Ivanka, and her husband, Jared Kushner, recently welcomed their second child, Joseph, who joined big sis Arabella, 2.