The newest Bachelor baby has a name!
"Our boy is here! We welcomed our sweet Joaquin Ramon Preciado on June 19 and our lives are forever changed," says Robertson, 36. "He weighed in at 7 pounds, 8 ounces, [measured] 21 inches long and is the most precious thing we've ever laid our eyes on."
"I'm the happiest girl in Arizona," adds the new mom, who shares her son with fiancé Humberto Preciado.
Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.
Robertson first revealed the news of her son's birth on Sunday, sharing a photo of Preciado and their newest addition at the hospital together. "My guys. So in love over here. Happy Father's Day," she captioned it.
"All the feelings," Robertson also shared, along with a selfie video of her and her newborn.
In another clip, the new mom filmed herself leaving the hospital as she captured her fiancé carrying her bag and their baby boy in a car seat.
Robertson announced her engagement to Preciado and the news of their baby boy on the way simultaneously in December, sharing a photo of the couple holding up a onesie that read "I [heart] NY."
RELATED VIDEO: The Bachelor Engagement Rings Cost How Much?!
In addition, the then-mom-to-be included a close-up of her diamond sparkler.
"Happy Holidays from the three of us 🥰," she captioned the post. "I can't wait to marry this man, with our son there 💙 Easiest 'YES' I've ever said 💍."