Ivanka Trump is officially a mother of three!

The business woman and daughter of Donald Trump welcomed a baby boy with her husband, Jared Kushner, on Sunday. The 34-year-old took to Twitter to announce the exciting news.

"Jared and I feel incredible blessed to announce the arrival of Theodore James Kushner. Xx Ivanka," she wrote. She also posted a photo to Instagram and Facebook that read, "It's a boy! We welcome with Love Theodore James."

"Jared, Arabella, Joseph and I are so excited to welcome this sweet little boy in to our family!" she captioned the photo. Later on Sunday night, she posted an adorable photo of herself holding her new baby boy. "Baby Theodore, my heart is full #grateful," she wrote.

Theodore James joins big brother Joseph Frederick, 2, and big sister Arabella Rose, 4. In September, Trump announced that she was expecting with adorable photos and a video of her and her children holding up the number three.

"I couldn't be more thrilled to share the news with you that I am expecting!" she wrote on her blog at the time. "Arabella and Joseph are both incredible excited to have a new sibling on the way. I consider myself incredibly fortunate to have a career that I am deeply passionate about, but, at the end of the day, it's my family that is at the center of my life - and to be adding another baby to our family is a tremendous blessing. Jared and I are so thankful, and so excited!"

She and Kushner, who is the owner of The Observer Group and CEO of Kushner Companies, have been married since 2009. "Jared and I are thrilled to announce that we'll be welcoming baby number three to our family early next year," she also said at the time. "It's an incredible blessing. We feel so grateful - and so excited!"

This is the eighth grandchild for Republican presidential front-runner Donald Trump. While on "Fox and Friends" on Monday, he joked with the hosts that he would not go into many "details" on the birth but did point out the fact that the baby was born on a special day. "We have an Easter baby, which is beautiful," he said.

Arabella, Joseph and I have a very special announcement to make! Check it out on my Facebook page! A photo posted by Ivanka Trump (@ivankatrump) on Sep 24, 2015 at 6:15am PDT