The country singer-songwriter announced the birth of Ada James with an adorable photo of the family posted to Instagram on Sunday morning.
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"Last night at 10:28 Pm Ada James Akins was born and it was truly the most amazing thing I have ever experienced," Rhett, 27, wrote. "I can't believe that we have two daughters!!"
The "Crash and Burn" singer added that he has a "newfound respect for moms" following his wife's long labor of 36 hours.
"My wife @laur_akins labored for almost 36 hours," he continued. "She is by far the strongest human being I have ever met and I have a newfound respect for moms around the world. We are so excited that Willa Gray has a baby sister! Thank you Lord