Cate Blanchett has caused a stir revealing she got a so-called 'penis facial' with Sandra Bullock in New York City.

The 48-year-old actress was promoting her new movie Oceans 8 when she told Vogue Australia about the unusually-named treatment.

'Sandy [Sandra] Bullock and I saw this facialist in New York, Georgia Louise, and she gives what we call the penis facial,' she said.

'It's something— I don't know what it is, or whether it's just cause it smells a bit like sperm—there's some enzyme in it so Sandy refers to it as the penis facial.'

Speaking to Daily Mail Online, Georgia Louise explained 'penis facial' has become the 'street name' in Hollywood for the procedure because it uses stem cells from the foreskin of Korean baby boys.

The 48-year-old star got a facial using stem cells extracted from the foreskin of Korean babies

This stem cell is then harvested and infused into the skin using a special microneedling technique to stimulate collagen production.

'It's a tremendous treatment but the "street name" for it is hilarious,' Georgia, who has treated stars including Emma Stone, Katy Perry, and Alexander Wang at her salon Georgia Louise Atelier, said.

She added: 'Poor Cate, I don't know how she's going to cope with all the reaction. I've heard some people say "oh, she's got c** on her face!" That's obviously not the case but yes... ridiculous.'

The stem cells are collected from the foreskin during circumcision, largely from Korea since it is home to many stem cell banks, including the largest cord blood bank in the world.

They are then harvested using a centrifuge and exported to the salons, where a facialist uses a microneedling technique to pump the stem cells into the skin.

Young blood and stem cells have become a darling of skin care and medicine in recent years.

Studies show the youth of the cells activate aging cells, giving them a new lease of life to make more collagen, which makes the skin plump and smooths out wrinkles.