Adele has reportedly enlisted the help of a personal trainer in a bid to drop two dress sizes.

The Sun reports that the singer made the decision to quit smoking and lead a healthier lifestyle after having to undergo throat surgery last year, which saw her cancel a number of tour dates. She has apparently also taken-up Pilates as part of her fitness regime.

"Adele has found so much more energy now she's quit smoking," a source told the newspaper. "She really wants to get healthier, now that she's half-way there.

"She had always been curious about taking up Pilates but until recently there just hadn't been any time."

However, the 23-year-old has apparently told friends that she does not want to give the wrong impression to her fans. In a previous interview, she said she did not want "to be some skinny mini with my t*ts out".

Meanwhile, it was recently reported that Simon Cowell is keen to sign Adele up for X Factor USA.

"Simon is always looking for new directions and ideas," a source told the Daily Star. "He thinks Adele's success and achievements are incredible.

"He recognises that true musicianship and a serious approach can bring a lot of credibility and an extra dimension to his show."