Hannah Waterman pregnant smoking closer online
The former EastEnders actress, who is documenting her weight-loss in Closer Magazine, was pictured smoking a cigarette after a gym work-out last week.
Speaking in her weekly column, she said: 'Oops! I'm in my trainer and my mum's bad books this week after being caught by the paparazzi having a fag outside the gym.
In fact, they both didn't talk to me for the day as they're so cross.'
She added: 'In my defence, I've stopped drinking, and am not eating very much, so giving up cigarettes is next on my list of things to do before I die prematurely! I've smoked for ages, but my trainer Adam wants me to run the London Marathon with him next year and says I'll need to quit if I want to do a decent time.'
The 34-year-old has shed two stone in the past two months, putting herself through a gruelling training regime.
The actress lost most of the weight ahead of her role as a prostitute in the play Rattle Of A Simple Man.
She enlisted Jade Goody's close friend Kevin Adams to help devise an exercise programme in order to shed the pounds and she unveiled her slimline look last month. Now the star is continuing her training to take on the challenge of competing in the London Marathon.
It had been rumoured that Hannah decided to lose the weight after signing up for the new series of Dancing On Ice, but she has so far refused to comment on the reports.
Meanwhile husband Ricky Groves, who plays Garry Hobbs in EastEnders, is being put through his paces on BBC's Strictly Come Dancing.
Read more: Dailymail