It was a spur-of-the-moment gift that one mum got hilariously wrong.

After spotting a cut-price glittering Vivienne Westwood t-shirt while out shopping, Helen bought it for £48 for her daughter Katie, 18.

Warning: Images below show cartoon depictions of explicit sex acts

Unfortunately, the design which she assumed was a marble effect was actually an orgy scene.

The gold lines are the outlines of various cartoon figures taking part in a variety of X-rated acts, which left Katie giggling and her mum shocked.

She tweeted about the hilarious mix-up, and was retweeted more than 3,500 times.

From a distance, the t-shirt design looks like an abstract pattern

"Honestly I can't get my head round it," the nursery worker told The Independent. "I wasn't expecting more than five favourites, it's going global.

"My mum has a great sense of humour so she's finding it hilarious. She's just as stunned as me as to why it's got so big."

But despite the eye-popping illustration on the front, Katie, from Scotland, says she will wear the t-shirt.

But close-up, the t-shirt turns out to be X-rated

"Vivienne Westwood is one of my favourite designers so I'll most definitely wear the shirt - even though it's a man's top!"