Eric Trump, son of President Trump, and his wife Lara welcomed their first child Tuesday.

"@LaraLeaTrump and I are excited to announce the birth of our son, Eric "Luke" Trump at 8:50 this morning," Eric Trump tweeted with a close-up photo of the newborn wearing a blue- and pink-striped hat.

.@LaraLeaTrump and I are excited to announce the birth of our son, Eric "Luke" Trump at 8:50 this morning. pic.twitter.com/b8zRSktcd8 — Eric Trump (@EricTrump) September 12, 2017

The baby is President Trump's ninth grandchild. His eldest son, Donald Jr., has five children with wife Vanessa. His daughter Ivanka, who works at the White House, has three children with Jared Kushner, who is also an adviser to the president.

President Trump congratulated the happy couple via Twitter.

"Congratulations to Eric & Lara on the birth of their son, Eric "Luke" Trump this morning!" the president tweeted.

"Congrats buddy," Donald Jr. also wrote on Twitter. "Welcome to the club. Now that the niceties are out of the way it's older brother revenge for that drum set to my kids."

Ivanka voiced her well-wishes on social media as well.

Welcome to the world, baby boy. I can't wait to meet you ❤️ https://t.co/sIkPrFWKO2 — Ivanka Trump (@IvankaTrump) September 12, 2017

"Welcome to the world, baby boy," she tweeted. "I can't wait to meet you."