Madonna, who last night ate at Locanda Locatelli restaurant in London, keeps her slender figure with a vigorous two-hour workout six days a week.

How she retains her wrinkle-free brow and her dewy complexion is open to debate.

She has resolutely refused to discuss cosmetic procedures – which has done little to dispel the rumours.

Some claim she has had cheek implants, a new A-list phenomenon which gives a plumped-up look.

There have also been claims the mother-of-three has undergone a relatively new procedure called the ribbon lift.

The 30-minute treatment, which is available at Beverly Hills clinics for around £4,300, uses a dissolvable implant to lift neck tissues through a short incision around the earlobe.

Experts believe it would explain her lack of wrinkles, even if Madonna is unwilling to do so herself.

‘I’m not against plastic surgery, I’m just against discussing it,’ she said.

The singer is currently dating model Jesus Luz, 22.

She has had a tumultuous year which saw her divorce Guy Ritchie and controversially adopt Mercy James, four, from Malawi, all while embarking on a gruelling world tour.

Last week she was in New York to celebrate daughter Lourdes’s 13th birthday with a lavish party at Delicatessen restaurant in SoHo.

Source: www.dailymail.co.uk