October 03, 2011 04:00 PM

Sara Jaye Weiss/Startraks

The latest addition to the Trump family has arrived!

Donald Trump, Jr. and wife Vanessa welcomed son Tristan Milos at 2:59 a.m. Sunday, Oct. 2, the proud dad announced via Twitter.

Weighing in at 8 lbs., 4 oz, Tristan joins siblings Donnie John III, 2½, and Kai Madison, 4.

“Mom and baby doing great!” Trump, Jr., 33, writes. “He can’t wait [to] meet his big brother & sister.”

Grandpa Donald Trump tells PEOPLE, “I am delighted that Don and Vanessa have a beautiful new member of their growing family.”

The couple announced the pregnancy in March, and were out and about in recent weeks, even sharing a smooch at the Trump Foundation Golf Invitational.

— Sarah Michaud with reporting by Charlotte Triggs

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