So what are the happy couple up to these days?

Gwyneth Paltrow and husband Chris Martin are known for their holistic approach to life - but now even their unborn child is getting in on the act.

The actress and the rock star, whose first child is due in June, have enrolled in ante-natal classes in ashtanga yoga, which is said to benefit the spiritual well-being of mother, father and unborn child alike.

Paltrow, 30, has been attending lunchtime classes at the Diorama Arts Centre in Regents Park three times a week, sometimes with Coldplay singer Martin at her side.Her teacher is Hamish Hendry, one of London's leading ashtanga experts.

Ashtanga uses correct breathing and postures to, in the words of the yoga system's website, allow students to "rediscover their fullest potential on all levels of human consciousness - physical, psychological and spiritual".

Paltrow is a recent devotee, her tutor creating lower intensity classes to protect her unborn child.

Experts say practising ashtanga yoga can improve a woman's stamina and confidence during labour and delivery, and help with pain management.

And, claimed another female practitioner, it "can cultivate mindfulness of the new life growing inside".

Paltrow is planning a water birth and has put a birthing tank in her Belgravia home.

It is understood that if a home birth proves impossible she will go to St John and St Elizabeth Hospital in St John's Wood - previously used by celebrity mothers Kate Moss and Sadie Frost.

Paltrow and Martin are teetotal and stick to a macrobiotic diet designed to boost the immune system and energy levels by balancing "yin and yang".