A woman has experienced a colossal selfie blunder after she realized her boyfriend was wiping his backside in the background... And she had it up on social media for an entire half an hour before noticing.

Keep scrolling to read more about this hilarious photobomb, and to see the disastrous selfie for yourself...

Shannon and her boyfriend, Henry seem to have the art of taking a selfie down to a tee.

The couple, from Gloucestershire, United Kingdom, have recently gained viral attention for their most recent selfie... But it is for all the wrong reasons.

Because, despite the rest of their Instagram selfies being perfectly lovely...

Shannon suffered a major blunder in one of her recent uploads.

Henry accidentally became the butt of her latest selfie...

Pun fully intended.

Now, Shannon is a big fan of the good, old fashioned mirror selfie.

Her Instagram page is adorned with the edgy selfies, but Henry accidentally, yet rather expertly, photobombed her latest mirror selfie attempt.

For her latest mirror snap, Shannon decided her bathroom mirror would suffice.

But, hilariously, Henry just couldn't wait to use the toilet, and his backside, mid-wipe, ended up being the star of the show.

Yep, Henry wiping his backside was in the background of Shannon's selfie...

And it was only after uploading the photo to her social media channels that Shannon was alerted to the comically unfortunate photobomb.

It really is one of the more cringe-worthy photobombs of our time.

Speaking to local media, she explained, "I was in [the bathroom] first and he came in and I was like, ‘babe I’m taking a picture,' and he just carried on so, I just took the picture without thinking anything of it and left."

And it took her days to even realize that anything was wrong with the selfie.

"I didn’t even upload the picture straight away; I left it a few days and thought, ‘ahh that’s a nice photo, I’ll put it on’, without even realizing he was in the background."

Understandably, Shannon was mortified upon discovering Henry's backside in her selfie...

But she managed to see the funny side. On discovering the hilarious selfie blunder, she said, "I was with my friend and we both immediately started crying laughing [when we noticed it] and I was like, oh my god, I need to delete it."

But her friends had other ideas.

She continued, "Then I mentioned it in the group chat and my friend was like you have to put that on Twitter, it will be hilarious."

So, Shannon obliged.

She shared the hilarious selfie was posted onto Twitter and, instantly, it blew up.

Shannon's unfortunate selfie was quick to go viral...

And it has now been retweeted over 10,000 times with over 100,000 likes.

And, of course...

This butt puns came flooding in.

Shannon's brother even got involved in the festivities...

And he didn't hold back. He wrote, "Good to know my future brother in law only pulls his boxers down to just below where he s**ts from, finishes s******g and turns to face the wall before standing up and wiping without toilet roll. Can’t get more normal than that."

Henry's bizarre wiping method has brought up many questions...

Several Twitter users have been scratching their heads as to why Henry is standing up as he cleans himself up.

And some people had other concerns...

Many pointed out that there is no sight of any toilet tissue in Henry's hand... Say it isn't so?!

Well, here it is, folks.

The incriminating butt selfie, in all it's glory. Shannon captioned her post, "As if I had this photo up on my insta for 37 minutes before noticing that my boyfriend is literally WIPING HIS ARSE in the mirror behind me, sound asf x."

Still can't see it?

via: Twitter

Here's a closer look.

But, luckily for Shannon, the internet came to the rescue.

Twitter user, Charley, posted Shannon's selfie with the full mirror (and Henry's behind, of course), expertly photoshopped out.

And Shannon loved the new, cleaner version of her selfie so much...

That she uploaded it to her Instagram. It'd be a waste of a good selfie otherwise, wouldn't it? For more disastrous selfie attempts, keep scrolling to read about the man who attempted to get a selfie with Donald Trump...