A mom on TikTok pulled a prank on her husband that went viral.

Kat Stickler decided to swap her baby with a friend's baby to see if Dad would notice. His reaction was priceless.

Stickler thought it would be a great prank to see if her husband would notice the baby in the stroller was not their baby, MK.

So she filmed it.

The beginning of the video shows her putting her friend's baby in the stroller and putting a bow on her head that normally MK would wear.

With her camera set up out of sight, Stickler strolled in the baby and said:

"Can you get her out of the stroller please?"

Her husband stared for a few moments, stood, then took the baby out of the stroller and said:

"This is not our baby."

"What are you... this is not our baby."

"Katherine, this is... is this a prank?"

Now comforting the equally confused baby and with a panic in his voice he asked:

"Who's baby is this?"

"Katherine, this is not our baby. Where's MK?"

Katherine came back into frame and told him it was a prank and apologized. He burst into laughter and relief swept over his face.

He sat on the couch with his head in his hands:

"I thought you lost our child."

With over 11.9 million views, TikTok saw this video and fell in love with this dad and his reaction.

@raneshacline/TikTok

@aly.marie.13/TikTok

@mrs.wiggins1/TikTok

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@connorsmithmusic/TikTok

@katstickler now has 6.4 million followers on TikTok and her husband Michael (@stickks__) has 76.5 thousand followers.

They both share videos of their family.