The couple, who are already parents to Spencer Frederick, 20 months, Tristan Milos, 2½, Donald John III, 5, and Kai Madison, 7, welcomed daughter Chloe Sophia on June 16.
Trump Jr. announced the happy news Wednesday on Twitter.
“Its a girl!!!! @MrsVanessaTrump and I are very excited to be bringing home our little bundle of joy today. #FullHouse,” he wrote.
Prior to giving birth, Vanessa Trump wished “Happy Father’s Day!” to her husband on Twitter.
“Happy Father’s Day to @DonaldJTrumpJr .You’re the best dad to our children always loving,caring,thoughtful &supportive! You win for #1Dad,” she tweeted.
Congratulations for their new bundle of joy to Vanessa and Donald Trump Jr.!