The Trump family is growing — President Trump’s son Eric is expecting his first child.

The 33-year-old son of the commander in chief announced his wife, Lara, is pregnant with the couple’s son in a Monday post on Twitter.

.@LaraLeaTrump & I are excited to announce that we are adding a boy to #TeamTrump in September. It's been an amazing year. We are blessed! pic.twitter.com/ENrhdxdziA — Eric Trump (@EricTrump) March 20, 2017

The pair married in 2014.

The baby boy will be President Trump’s ninth grandchild. Lara Trump told People that when the pair told the president, he was “so excited” that they were “worried he’d blurt it out at a press conference.”

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Eric Trump said he learned his wife was pregnant on his birthday in January, which was just two weeks before his father’s inauguration.

The younger of Trump’s two adult sons, Eric Trump said he and his wife are busy brainstorming baby names, telling the magazine, “We really loved the name Charlie, but we’d already named our dog that, so it’s out.”