Zellweger is known to follow harsh beauty routines which includes-'facial sandblasting', before she makes a red-carpet appearance, reports the Daily Mail.
Before every premiere, the 'Jerry Maguire' star undergoes a three-hour process of 'sandblasting', which is designed to rid her skin of blemishes and keep her looking young and fresh.
The treatment, which costs 145 pounds, includes applying of special oxygen and milk facemask dubbed a 'pre-extraction oxygen wrap', and the face is covered in two layers of cling film.
When it is removed an oxygen spray containing vitamins is sprayed on the face and neck. It purports to kill surface bacteria to help keep skin clear and blemish-free.
Then comes the hour-long "sandblasting", in which aluminium oxide crystals are sprayed on to the face to reduce age spots and sun damage, and smooth out fine lines and wrinkles.
However, beauty therapists have warned that the process could leave the skin red and traumatised for up to a day later.
It is said that Zellweger loves the dramatic effects that the "sandblast" facial provides.