Forget Angelina Jolie's 'genetics' theory, Halle Berry is ditching her baby weight the hard way - by spending hours on end in the gym.

The actress spent 3 hours doing a yoga workout on Friday.

But being voted the sexiest woman in the world by Esquire magazine must have its pressures to look good - and to look thin.

Halle's gruelling workouts seem to have paid off though - she's back to her post-baby weight just 7 months after giving birth to daughter Nahla.

Wearing a knitted cap and leggings, the yummy mummy was accompanied by her instructor for the lengthy workout session.

See Halle's svelte new figure below