The former Spice Girl credits new 100-pound (about US$173) Geisha Facials, a paste made from nightingale droppings, for improving her acne prone complexion.

A source told Britain's Closer magazine: "When Victoria was in Japan recently she was admiring the local women's clear skin and discovered it was down to these facials.

"She was intrigued and when she got back to the US she found that some New York beauty salons now offer the treatment.

"She tried it and loved how great her skin looked. She also uses a cream derived from nightingale poo at home."

Meanwhile, Victoria is reportedly encouraging her close friend Katie Holmes to launch her own fragrance.

A source revealed: "Victoria has been very involved in her and David's fragrance, "Signature," and is keen to extend her work in that field.

"Victoria believes Katie would be an ideal candidate for a personally branded perfume although she understands Katie's husband, Tom Cruise, won't follow in David's example and do a 'for him' version of the scent."