The 47-year-old television personality welcomed a baby boy, Grayson Robert, with wife Jessica Canyon on Monday.
Guiney announced the news in an Instagram post. He gave fans a glimpse of his son napping at a hospital in Bellevue, Wash.
"Today is the greatest day!! Our son, Grayson Robert Guiney, was born early 12/3/18," Guiney captioned the post.
"@jescanyon and baby are healthy and beautiful! Mom is resting with him on her chest right now. We are so excited and thankful for what this new day brings for our family! #myson #love #family," he added.
Guiney and Canyon celebrated Thanksgiving with family and friends in November ahead of their son's birth.
"So much to be thankful for #HappyThanksgiving," Canyon captioned a festive photo. "#pregnant #turkey #autumn #grateful #blessed #thankful #babyboy #comingsoon #pregnancy."
Guiney and Canyon married in November 2016 in Punta Mita, Mexico. Guiney announced Canyon's pregnancy in an interview with People following Father's Day in June.
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"We're so excited!" he said at the time. "We've been keeping it secret for quite a while and we couldn't wait to share it with everyone. We're feeling so lucky and very thankful!"
Guiney was previously wed to Jennifer Lantz and Rebecca Budig. He competed for Trista Rehn's affections in The Bachelorette Season 1 before starring in The Bachelor Season 4.
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