Kelly Osbourne and mum Sharon work out together

The TV star - who lost a considerable amount of weight during and following her appearance on 'Dancing with the Stars' – says her mother is so impressed with her figure she has started exercising with her and her personal trainer.

She said: "Mum's started to work out with me and my trainer, Sarah Hagaman. She loves it."

The 25-year-old beauty admits it was hard work losing so much weight, but she is glad she did it the right way by eating healthily and exercising.

Writing in her Closer column, Kelly – who recently split from her model boyfriend Luke Worrall – said: "My weight loss has been healthy and gradual. I haven't gone to extremes –it's just been down to smart eating and regular exercise."

However, Kelly's new enviable figure isn't just down to hard work and discipline - control underwear Spanx is her secret weapon to look good.

She said: "I love Spanx – not so much for sucking you in, but more for smoothing you out. There's nothing I hate more than being able to see someone's belly button through their dress."