Twitter user Sophie Eke was in stitches after realising the X-rated surprise hidden in her mother's picture.
The UK woman had been attempting to sell a chests of drawers and wardrobes online, and had taken a few photographs.
It wasn't until she uploaded the pictures onto social media when she realised the horrible mistake.
Unbeknownst to her, a tiny mirror on the wall was reflecting the woman's naked breasts.
She only realised the mistake when a kind Facebook user alerted her to the inadvertent nudity.
'I don’t mean to be rude but I thought I’d let you know… it seems there are some boobs in the mirror!' the stranger said.
Horrified, the woman texted her daughter Sophie - resulting in a viral Twitter post.
'Nice one mum,' she said, adding laughing emojis.