Olympic gymnast Louis shared the photo with fans via Instagram in May, showing the pair almost baring all for a belfie aka bottom selife.
Louis even asked fans: "Who has the better derrière? Me or @lucymeck1 haha #battleofthebutts."
Well, former TOWIE star Lucy has now revealed that Louis posted the picture without her permission - and she wasn't too impressed by it.
Speaking to the Daily Star, Lucy said: "We'd had a couple of drinks and were just messing around. I didn't know he was going to post it the next day.
"Louis got into trouble for that."
Lucy and Louis met on the set of BBC gymnastics show Tumble last year, where she was a contestant and he was a judge, however, romance didn't blossom for the pair until after the show.
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Lucy Meck - life after TOWIE: