Leave it to Donald Trump to be the one to break the news.
And, in the process, he also shared with the world what the little tyke has been named.
"I just left the hospital and the baby is beautiful," Trump said, before adding: "Arabella Rose is the baby's name. I just found that out by the way."
Soon after Dad's big announcement, Ivanka took to Twitter to comment herself about her bundle of joy.
"Jared and I are having so much fun playing with our daughter!" she tweeted. "Arabella Rose is beyond adorable. She's truly a blessing."