Ivanka Trump has welcomed her third child with husband Jared Kushner.

Ivanka, an adviser on The Celebrity Apprentice and daughter of GOP frontrunner Donald Trump, gave birth to a baby boy on Sunday at 5:43PM.

"Jared and I feel incredibly blessed to announce the arrival of Theodore James Kushner," the 34-year-old businesswoman captioned a photo on Instagram.

The couple welcomed a daughter Arabella, now 5, in July 2011 and a son Joseph, now 2, in October 2013.

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

Ivanka later shared the first image of her newborn on Facebook, writing, "Baby Theodore. My heart is full," before adding the hashtag "grateful."

Ivanka and Jared, 35, announced the pregnancy in September of last year by posting an adorable home video.

Theodore is Donald's eighth grandchild. Ivanka has been tagging along for much of her father's campaign trail.

Ivanka and Jared, the owner of the New York Observer newspaper, began dating in 2007 and tied the knot in 2009.