Ivanka Trump and her husband Jared Kushner have welcomed their third child together, a baby boy.

"Jared and I feel incredibly blessed to announce the arrival of Theodore James Kushner," Trump wrote on Instagram Sunday alongside a photo announcing the arrival of her son.

"Jared, Arabella, Joseph and I are so excited to welcome this sweet little boy in to our family!"

The daughter of Republican presidential candidate Donald Trump later shared the first photo of Theodore on Facebook.

"My heart is full," she wrote accompanied by a photo of herself holding the wrapped up newborn in her arms while on a hospital bed.

Married in 2009, Trump and Kushner are also parents to daughter Arabella, 5, and son Joseph, 2 who were looking forward to a new sibling when the 34-year-old mogul announced her pregnancy in September.

"Arabella and Joseph are both incredibly excited," Trump said at the time. "Of course, Arabella desperately wants a baby girl and Joseph hopes it's a boy!"

While on the campaign trail, Donald Trump has referenced his daughter's pregnancy and upcoming grandchild frequently.

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"I have a great family, I just really want to thank all of you," he said during a campaign stop in South Carolina. "And Ivanka, we have a hospital ready just in case, and South Carolina, we're going to have a baby and there's nothing wrong with that. It could be any second. It could even be before I'm finished [giving this speech]."