Alongside the video, she wrote, "Hologram from Heaven.
"For my birthday, Kanye got me the most thoughtful gift of a lifetime. A special surprise from heaven. A hologram of my dad. ✨"
CHECK OUT: The Kardashian-Jenner's biggest Photoshop fails EVER
The Kardashians' biggest Instagram Photoshop FAILS ever
The wall behind Kylie's waist on the left sure ain't straight.
Followers questioned whether Kim had Photoshopped North West's eyebrows. What do you reckon?
Did Kim try to make Jonathan Cheban's waist smaller? Fans thought so when she uploaded this pic.
Does it look a bit stretched to you? Hmm.
Remember when W magazine totally erased Kendall Jenner and her pal Gigi Hadid's knees? Bloody hell.
Check out the sliding door on the left. You okay, huns?
Fans wondered whether Kris had made her waist trimmer in this pic.
The curved reflection in the mirror had everyone questioning if Khloé had over-edited her snap.
2015 Kylie was our FAVE Ky. Remember the Vines? The blue hair? A vibe but in this pic fans couldn't help but notice her bum looked INCREDIBLY round...
Followers accused Kris of smoothing out Gordon Ramsay's face in this pic a few years ago.
Kim captioned this pic 'Found this pic I took in the bathroom on set of My @calvinklein shoot,' but fans were quick to spot - you guessed it - a wobbly wall.
Fans even accused Kim of Photoshopping this throwback pic from '99. Brutal.
Fans accused Ky of Photoshopping this snap after they pointed out that the walls look curved.
OK so this isn't the photo in question (because she's since deleted the snap) but remember when she posted these pics and fans accused her of editing her legs? Bless her.
In the video, Robert, who died in 2003 at the age of 59, tells Kim, "Happy Birthday Kimberley. Look at you, you're 40 and all grown up.
"You look beautiful, just like when you were a little girl. I watch over you and your sisters and brother, and the kids every day. Sometimes I drop hints that I'm around, like when you hear someone make a big peefee, or when you make a big peefee..."
What's a peefee, you ask? Yeah, we're not too sure, either, and a quick Urban Dictionary search doesn't give, err, the most savoury answer. Apparently it's a p--sy fart, so we're going to presume that it has a different meaning in the Kardashian household, though, we wouldn't be surprised if it didn't.
Kim continued to write, "[The hologram] is so lifelike and we watched it over and over, filled with lots of tears and emotion. I can’t even describe what this meant to me and my sisters, my brother, my mom and closest friends to experience together.
"Thank you so much Kanye for this memory that will last a lifetime ✨."
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It's certainly impressive, if a little eerie, and fans in the comments were conflicted about how to feel.
"This is literally the sweetest thing ever," commented one fan.
On the flip side, another wrote, "Am I the only one that thinks this is terrifying?"
Honestly, we're not sure what to think, but the power to recall loved ones (kind of) who have passed away is quite revolutionary either way.
And, we're sure most people would relish the chance to hear a lost family member say, "I love you," just one last time. Wouldn't they?