Marnie decided to brave the camera without her war paint, and gave fans a good look at her lips au naturel. She claimed she hadn't pouted for the photo or used any lipliner, in an attempt to prove her lips are your 'normal, average size.'
Alongside her post, a fresh-faced Marnie added the caption: "Train selfie #NoMakeUp I look like a little boy sometimes THIS IS MY LIPS WITHOUT A POUT OR LIPLINER BTW. JUST A NORMAL AVERAGE SIZED MOUTH. So leave all the negative comments out please!"
She also revealed that she'd had her locks taken a shade darker, adding: "I love having my hair dark again thanks @longlox_hairextensions the colour is [thumb ups]."
Fans were quick to jump to Marnie's defence, and told her not to worry about those making negative comments about her appearance.
One follower said: "Such a beautiful girl. Don't let the haters get you down, their just jelous because you can afford it." Another added: "Don't worry about negative comment marnie you look beautiful."
While Marnie has admitted to having lip fillers in the past, it seems she is now favouring a more natural look.
The reality star has previously spoken of her plans to have her lip fillers taken out and Marnie recently underwent treatment to have her cheek fillers dissolved.
She recently credited her cosmetic doctor for making her face feel "on flleek" after having the procedure.
Removing her cheek fillers came after Marnie recently came under fire for claiming to be a natural beauty in her Geordie Shore VT.
In the opening credits of the reality show, Marnie says: "I'm a natural beauty, real boobs, real hair."
Fans had called her out, after she 'fessed up to having several treatments done - including a non-surgical nose job.
However, Marnie pointed out that technically her intro is correct as her boobs and hair are still real. While she did have a breast uplift, she didn't have any implants put in.
Marnie tweeted: "Will everyone shut up about my Geordie Shore VT intro. I said that 3 years ago when I WAS 100% a natural beauty."
"I'm not an idiot. I do know that now I'm not 100% a natural beauty, I am [not] a f**king Geordie Shore editor," she added. "Can I change it? No I can't! So do me a favour and change the record all you tiny, annoying people. It's getting very boring."
Follow us on Twitter @RevealMag for all your celeb, fashion and beauty news!
Fancy winning some GREAT prizes? Check out Reveal Competitions here!