"As a busy mother I don’t have a lot of time, so I usually just cleanse and moisturise twice a day and always wear sunscreen. But to be honest, I think a lot of how you look is about how you live. I’ve never smoked or indulged in alcohol or drugs. Those are things that show up on your face over the years."

"If I wake up in the morning and look tired and puffy, I fill a sink with ice and cucumber and submerge my face. It instantly tightens everything making you feel and look instantly better."

"There's a scrub by Carol's Daughter - Ocean Sea Salt Scrub - it feels like the beach and it has the most beautiful scent. I'm always rushing, and this scrub is moisturising, so it cuts out a step for me because I don't have to completely cover myself with lotion."

"If your skin is problematic or you're having a lot of breakouts, apple cider vinegar is really healing. It's a little bit stinky but if you're not sleeping over at your boyfriend's it's really effective!"

"I love using natural oils. I use avocado oil and Hawaiian Kukui Oil on my face. I like to keep things natural, simple, and straightforward."

"I like an intense facial massage; I think it's so important. I see the facialist Una Brennan, who operates out of her living-room in Notting Hill in London - I call it Una's Chambers. It's a pretty intense experience: she uses freezing ice masks that make you feel as if your brain is going to fall out of the top of your head. You look wonderful afterwards, though."

"One strange tip - don't wash your face in the morning, at all, never. Because at night your skin is rebuilding some of the oils that you need to keep your skin young, and it balances the PH.

"So in the morning if you take them off - you can splash it with water, do something mild - but you don't want to get rid of that. And if your skin is dirty in the morning, it means you didn't clean well at night."

"Mary-Louise Parker turned me on to [celebrity facialist] Tracie Martyn's facials. During awards season, I see her every couple of weeks — otherwise, I just can't hold it together. Her Amla Purifying Cleanser takes away redness and swelling from flying — or prosthetics. I went through several bottles on the set of The Reader."

"I think we have a tendency to over-primp, to over-clean. I rarely go for facials. I think that the more you strip away the more vulnerable your skin is."

"Hydrating my skin is my priority when choosing skincare products. I am obsessed with Dr. Perricone’s products. My favourite is the No Foundation Foundation, a hydrating lotion with SPF.

"I clean my face with rose water because tap water dehydrates my skin. In the mornings and evenings, I cleanse using a little rose water dabbed onto some cotton. It’s really refreshing."

"Diana was very aware of her beauty regime, cleansing, toning and moisturising twice a day," says the late royal's make--up artist Mary Greenwell.

"She was very sensible when it came to her skin, she would always make sure she took her make up off at the end of the day and make sure she always had a clean face before applying make up. Diana did everything in moderation. She cut back on drinking so her skin was 100%."

"Exfoliate, exfoliate, exfoliate. It’s the only way to keep skin soft, smooth and glowing.

"In the morning I use Dr Hauschka cleanser and toner then moisturise with Dr Sebagh or Environ. In the evening I’ll take off make-up with Environ Eye Make-Up Remover, then repeat my morning routine."

"I wash my face with a good cleanser, and I use a moisturizer with an SPF. Every now and then I'll go to a dermatologist for microderm or a facial, but I don't have time to do that all the time."

"It’s widely known that Kate loves the Karin Herzog brand," says the Duchess of Cambridge's skincare therapist Julie Cichocki.

"I introduced it and have done a lot or work to promote this brand. I use it with all my VIP clients, because it works at putting oxygen and water back into the skin."

"The number one beauty tip [celebrity make up artist] Scott Barnes has taught me is to stay out of the sun. We’ve always worked with bronzers and self tanners instead. It’s been over 10 years now that Scott has been telling me to stay out of the sun and it has saved my skin."

"If you understand how your body works you can make the right choices. I used to have bad acne and little white bumps. I cut out dairy and my skin changed completely."

"I travel with a skincare kit, and one of my must-haves is a whitening roll-on cream face mask from Guerlain.

"I also used to suntan back in the '80s when it was trendy to do so. But I noticed that doing so aged my skin, so I stopped and now, I never go anywhere without slapping on sunscreen first."

"Dermalogica facials are super-effective. I love face packs too and try to do two a week using Dermalogica’s MutiVitamin Power Recovery Masque, which I call my little ambulance in a tube."

"I drink lots of water. Use a good moisturiser for your skin - I use Wrinkle De-Crease by L'Oreal Paris.

"Although it is rather indulgent, I also rinse my face with Evian water. I feel it really cleans and softens my skin."

"I’ve learnt a lot about my skin over the years. I tend to get oily on the T-zone of my face, while other areas are normal, so I always cleanse my face with a wash that contains salicylic acid and then I’ll moisturise."

"I drink gallons of spring water every day. It's good for your skin and flushes out your system.

"I have plenty of facials. That's my addiction. I use Vita-A-Kombi, a magical lotion. It costs £47 a jar, but it keeps pimples away."

''Beets and carrot juice are a great way to cleanse the system and purge unwanted toxins from the body, which ultimately leads to healthy-looking skin.

"One piece of advice my mother gave me was to apply yogurt on my dry skin."

"If I've been on stage I'll use an oil cleanser and if not then a foaming cleanser. If I'm going out I'll put a mask on, a SK-II Facial Treatment Mask. That's my one stop facial. I think regularity is something your skin responds to. I put SK-II Facial Treatment Essence on which seems to lock in the moisture but also feeds my skin. It's like a vitamin drink for my skin."

"I drink a lot of water, and I've never had coffee. I think caffeine can be really bad for your skin. And I don't get facials, ever."

"I never wear makeup [on days off]. I'm not good at putting on makeup, so I never wear makeup. I normally stay in my pajamas forever."