'OutDaughtered' Stars Adam & Danielle Busby Mark Quintuplets' Major Milestone

OutDaughtered stars Adam and Danielle Busby are celebrating a major milestone for their quintuplet daughters. And fans can hardly believe how much they've grown.

On April 8, the quints—AvaOliviaHazelRiley and Parker—officially turned 10.

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Adam took to Instagram with a duo of photos to mark the special occasion, also sharing a sweet birthday tribute.

"10 years ago - April 7, 2015 we took a tour of the operating room," the doting dad captioned his update on the eve of the quints' birthday. "Little did we know our life would be very different the following day. The next day we would welcome our miracle quintuplet girls into the world."

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In the featured image, Danielle sat in a wheelchair with a hospital gown and surgical cap in a hospital operating room. The second snap showed her smiling with one hand on her baby bump next to a sign that read, "I am 28 weeks. Quint Bump."

Adam continued, "I just kissed them goodnight for the last time as 9 year olds. Tomorrow they will hit double digits. What a ride this past 10 years has been."

In the comments, Adam's followers were in denial that his and Danielle's quints were already 10.

One person wrote, "I can't wrap my head around that the girls are going to be 10 tomorrow. Happy birthday to your beautiful babies❤️."

Another Instagram follower echoed, "I can't believe they are already going to be 10! Happy Birthday Olivia, Ava, Hazel, Riley, and Parker! ❤️🩷💚💜💛."

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"Nooo weren't they 5 😢😢😍😂," someone else lamented, as a different fan marveled, "How has it been 10 years?!? Happy Birthday girls!"

Meanwhile, yet another fan declared, "They grew up so fast, my god!"

In addition to their quintuplets, the TLC couple also share an older daughter, Blayke, 13.

All 10 seasons of OutDaughtered can be streamed on Max.