She is planning to host a Hugh Hefner-style party and has vowed to dress up as a Playboy bunny.

But the former STV newsreader has found it tough to return her figure to its pre-baby shape after the birth of her second son in 2008 and decided she needed a little help to look her best in the saucy costume.

The mum-of-two found London-based personal trainer Rosa Whitehead, who uses pilates to help new mums get rid of their sagging tums and restore their pre-birth body shape.

It's now six months into her fitness and wellbeing programme and Sarah said she was already feeling the benefits of her twice-weekly pilates sessions.

The 39-year-old, who also runs four times a week, is praying all her hard work will pay off so she will feel "fab at 40" and confident enough to don the figure-hugging outfit for her glitzy 40th birthday bash on May 22.

She said: "I am not getting in a bunny outfit until I am fit.

"My core muscles went when I had kids. I have gone to the gym on and off for a few years and do a lot of running but I am fast approaching 40 and I definitely wanted to do something about my middle bit.

"That's my problem area where I put on weight.

"Since meeting Rosa, my stomach has changed shape and is starting to rein itself back in. I am holding myself better now and I am losing inches. It's great when people say to you, 'Gosh, you've lost weight'. I feel a lot stronger than I have ever felt."

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