Katie Holmes is queen of lean as she wears toga to unveil her toned new look

The wife of Tom Cruise who famously ran the New York marathon sans bra, appears to have stepped up her fitness regime judging by the muscular look she unveiled at an awards ceremony on Monday.

Wearing a cream one-shouldered toga-style gown covered in sequins, Katie's upper body appeared extremely toned, and devoid of a spare ounce of fat as she carried out presenting duties at the Critics' Choice Awards.

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Muscle mama: Katie Holmes has undergone somewhat of a transformation but her new muscular look unveiled at last night's Critic's Choice Awards could give Madonna a run for her money

The mother-of-one continued her transformation from frumpy to fabulous which saw her back to her svelte pre-pregnancy weight just five months after the birth of her daughter Suri, 20 months.

With the help of a gruelling physical regime devised by husband Tom, the combination of Katie's marathon training, and gym workouts with a personal trainer helped the star regain her leading lady figure.

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Slimline: Katie was back to her slimline pre-pregnancy figure quickly, but now her weight training has toned and tightened her body further

But it is the addition of regular weights sessions which have given her a sleeker, highly-toned appearance.

The 29-year-old actress has returned to the silver screen with the release of her first film post-baby.

Katie stars in "Mad Money" a female heist film with former Woody Allen stalwart Diane Keaton and Queen Latifah as Holmes' fellow robbers.