Trump, who appears with her father on TV's "The Apprentice," married New York Observer owner Jared Kushner in October 2009.
"I have been wanting to share some amazing news with you all for some time," People.com quoted Ivanka Trump as saying in a Twitter message Friday. "I'm pregnant! Jared and I couldn't be more excited."
She did not mention her due date, or whether she is expecting a boy or girl.