The former Coronation Street actress admitted that Manchester City player Scott Sinclair came close to getting mowed down when she reversed their car without realising he was behind it.
"My wing mirror [is] hanging on for dear life," she wrote. "I nearly ran over my bf today too put it in reverse didn't realise he was getting his...suitcase out the boot :/."
The 22-year-old added later: "I didn't nearly kill him. His face was a picture though. I do take the piss out myself though x roll eyes."
Helen Flanagan and Scott Sinclair
Perhaps feeling guilty, Flanagan tweeted after the near miss that she feels like "the luckiest girl" to be with Sinclair, adding: "He's so amazing :) x"
Flanagan has got herself into trouble on Twitter before, most notably when she posed with a gun to her head after the Newtown school shootings in the US and bemoaned her lack of weight loss during I'm a Celebrity, declaring: "[I've] stayed a size six."
Helen Flanagan's controversial gun photo
In another tweet, Flanagan pledged that she was "going to stop reading all this rubbish" from users on the site "that write such nasty things when they don't even know you".
"[I'm] becoming more wary in my old age #wiseowl not so innocent and niave," she said. "There are unfortunately snakes in the grass but some very nice."