Think Olivia Munn's face looks a little different these days? She's shared why.

Image: Getty.

Remember when Renee Zellweger‘s face suddenly became the fodder of thousands of headlines a few years ago? Or recently when X-Files actress Gillian Anderson’s mug was subjected to intense scrutiny in a newspaper?

Well The Newsroom’s Olivia Munn decided to take a proactive approach, posting an Instagram ‘before and after’ pic briefing followers on why exactly her face looks differently to how it appeared just a year ago.

The secret to her youthful (yes, alright she’s only actually 35 years old) skin? No botox to see here, folks. It’s something a little, erm, less conventional.

Ask anyone who knows me and they’ll tell you I love research. Convinced that there’s got to be natural, healthy ways (ie not only the rich and connected can do it) to keep your skin from aging, I do lots of research. Who says guys are the only ones who can get better with age? We’re gonna turn that myth around if we share what we learn with each other. So here are 4 skin tips I’ve learned just over this past year that really helped the texture and shape of my face. Left Pic: 1 year ago. Right Pic: Last month. 1. I lost 12 pounds this past year while training for Xmen. I kept it off by coming up w/an hour workout I do a few times a week. The weight loss leaned out my cheeks and jawline. Working out is also great for your skin because it increases blood flow to your face which helps rejuvenate. 2. Reshaped my brows. I do my own brows and always thought they were supposed to have a high arch. Then a facialist pointed out to me that I was shaping my brows into a frown. So I let the top of my brows grow in (which is never fun because it looks spotty for a few weeks) and then I plucked the bottom. That gave my brows a more horizontal angle and instantly brightened my eyes. 3. Got rid of sunspots. I love my freckles. But over the past couple of years I’ve seen more come up and merge with other freckles to make large dark spots. Dark spots prevent your skin from reflecting light and gives you a dull complexion. So for the past year I’ve been diligently using @Proactiv Mark Fading Pads. I wipe my face with one every night and now my face has a more even tone and the large spots aren’t as noticeable. 4. I’ve talked about this before and I still stand by it: Japanese potatoes that are high in Hyaluronic Acid help keep wrinkles away. Look up this video: “Connie Chung Yuzihara” to learn all about it. There are Hyaluronic Acid pills and vitamins but I think that the best way to get it in your system is by eating them in foods that naturally have them. I’m still looking into what gets rid of the lines that develop around your neck. I think it has to do with tension and acupuncture might be the answer. When I find out more, I’ll let you know. ??

A photo posted by Olivia Munn (@oliviamunn) on Feb 23, 2016 at 6:26pm PST

“Ask anyone who knows me and they’ll tell you I love research. Convinced that there’s got to be natural, healthy ways (ie not only the rich and connected can do it) to keep your skin from aging, I do lots of research,” she wrote.

“Who says guys are the only ones who can get better with age? We’re gonna turn that myth around if we share what we learn with each other. So here are four skin tips I’ve learned just over this past year that really helped the texture and shape of my face.”

The two pictures in the image were taken a year apart, with one one on the right just a month ago. (Watch: Mia Freedman talks about getting laser on her face. Post continues after video.)

Turns out the changes  from Munn’s research are down to  mix of hard work and a few clever tricks. Pens and notepads out, friends.

1. Brow makeover.

They say brows are key to framing your face, something Munn now knows all too well.

“I do my own brows and always thought they were supposed to have a high arch. Then a facialist pointed out to me that I was shaping my brows into a frown,” she wrote.

“So I let the top of my brows grow in (which is never fun because it looks spotty for a few weeks) and then I plucked the bottom. That gave my brows a more horizontal angle and instantly brightened my eyes.”

2. Eating potatoes.

“I’ve talked about this before and I still stand by it: Japanese potatoes that are high in Hyaluronic Acid help keep wrinkles away. Look up this video: “Connie Chung Yuzihara” to learn all about it,” she wrote. (Post continues after video.)

“There are hyaluronic acid pills and vitamins but I think that the best way to get it in your system is by eating them in foods that naturally have them.”

The next superfood, anyone?

3. She’s been working out.

In preparation for her upcoming role in X-Men, Munn was required to get fit, losing just under five and a half kilos.

“I kept it off by coming up with an hour workout that I do a few times a week. The weight loss leaned out my cheeks and jawline,” she write.

“Working out is also great for your skin because it increases blood flow to your face which helps rejuvenate.”

As well as physical benefits, exercise also has a wealth of mental benefits, particularly in managing anxiety disorders.(Post continues after gallery.)

4. Bye bye sunspots.

A current beauty trend may be to add (fake) freckles to your face, but Munn has moved in the opposite direction by getting rid of her sunspots.

“I love my freckles. But over the past couple of years I’ve seen more come up and merge with other freckles to make large dark spots. Dark spots prevent your skin from reflecting light and gives you a dull complexion,” she wrote.

"So for the past year I've been diligently using Proactiv Mark Fading Pads ($34). I wipe my face with one every night and now my face has a more even tone and the large spots aren't as noticeable."

Her next mission? Those lines around your neck.

"I think it has to do with tension and acupuncture might be the answer. When I find out more, I'll let you know," she said.

We'll be listening.

What's your anti-ageing tip?