Name and photos revealed Joanna shared pictures on Instagram, saying "Crew Gaines, is here and we couldn't be more in love".
Chip and Joanna already have four children: Drake, 12, Ella, 11, Duke, 9, and Emmie Kay, 7.
Joanna said he arrived two and a half weeks early. We are so grateful.
Before welcoming their new child, the Gaines family had to say goodbye to their HGTV Show "Fixer Upper", the final, emotional episode of which aired in April.
"I had been feeling a little emotional and insane and thought, 'Wow, this isn't me, '" she said in May on her blog while reflecting on her first reaction to becoming a mom for the fifth time.
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The proud papa announced the birth Saturday on Twitter.
He did tweet: "10 lovely toes and 10 handsome fingers all accounted for, and big momma is doing great!"
Chip revealed the baby's gender back in March during a sweet conversation with his buddy Gage, an 8-year-old boy with a rare genetic disorder. "Including having an wonderful family AND career you love", he tweeted back in April. "Fixer Upper" featured home improvement and renovation projects in Central Texas.
It's been quite a while since Joanna had a newborn in the house.
Congrats to the happy family!