The 29-year-old American married businessman Jared Kushner in 2009 after the pair had dated for two years.
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The couple are now expecting their first arrival and couldn't wait to share the happy news on Twitter.
Ivanka tweeted: "I have been wanting to share some amazing news with you all for some time… I'm pregnant! Jared and I couldn't be more excited!"
The new arrival will be Donald Trump's third grandchild, as his son Donald Jr (pictured below) has two children already.
And The Apprentice host seemed very excited at the prospect of adding to his family. Speaking to a US website he said: "I am very happy for Ivanka and Jared. They are wonderful young people!"
Famous faces such as Piers Morgan have already taken to Twitter to congratulate mum-to-be Ivanka.
"Congrats to @Ivanka Trump on her pregnancy news - bet she wins a Most Glamorous Mum award before the end of the year," tweeted Piers.