"Jared and I are so excited that Arabella will become a big sister this fall," Trump Tweets. "Thanks for all your good wishes!"
Expanding the family will make life even more hectic for Ivanka, 31, given her top executive role at The Trump Organization. But she's found a great balance as a working mother — though don't use that term around her!
"I think the expression 'working' versus 'non-working' implies that a mother who stays home doesn't work. It's far more difficult than anything I do in the office," she recently told Redbook.