Taking to her Instagram on Saturday, the 36-year-old singer announced the arrival of their son, Ziggy, with an adorable snap of the sleeping newborn.
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"10-29-2020 Ziggy Blu Ross. Our sweet boy has arrived! I'm over the MOON we are so Blessed!" Ashlee captioned that pic, as Evan, 32, posted the same photo to his account, writing, "Our son has arrived! I'm in heaven!"
The cute couple are also parents to 5-year-old daughter Jagger Ross, while Ashlee shares 11-year-old son Bronx with ex-husband Pete Wentz as well.
Ashlee first announced the baby news in April 2020 by sharing a photo of herself, her husband and a pregnancy test. "We are pregnant and we are so excited to share it with everyone. Baby #3," she wrote on social media.
They also revealed they were having a boy with a cute gender reveal party. Not everyone was excited at first, however, as little Jagger was expecting a different outcome.