Donald Trump Jr. and his wife Vanessa Trump are continuing to add to their already-large family.

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"Well [Vanessa], Kai, D3, T-man, Spencer & I have some exciting news... We are expecting baby #5 this summer. Can't wait. #evenlesssleep," The Apprentice advisor tweeted Tuesday.

The couple's fifth child will also be the seventh grandchild for Trump Jr.'s father, The Apprentice star Donald Trump. The baby's sex has yet to be revealed. 

The new baby will join siblings Kai Madison, a six-year-old daughter, who was born in May 2007; Donald Trump III, a soon to be five-year-old son whom Vanessa gave birth to in February 2009; a two-year-old son named Tristan Milos Trump, who was born in October 2011; and Spencer Frederick, a 13-month-old boy, who was born in October 2012.

Trump Jr. has been married to Vanessa, both 36-years-old, for eight years.

Trump Jr.'s sister Ivanka and her husband Jared Kushner, who wed in 2009, recently welcomed their second child, Joseph, into the world in October of last year. They also have a two-year-old baby girl named Arabella, who arrived in July 2011.

Ivanka has also served as a boardroom advisor on The Apprentice.