The songstress revealed her striking black and white nude image yesterday (30 September), in which she is seen taking a stand against wearing fur and animal cruelty.
25-year-old Alex's intimate tattoos of a dove and roman numerals can be made out on the side of her body, as well as the silhouette of her rock hard abs.
Her hair has also been styled in pretty curls and written across her body is the famous mantra of PETA's well-known campaign, 'I'd rather go naked than wear fur'.
Although this image is one of dozens championed by PETA in the fight against fur, Alex admitted that she had been apprehensive before having her picture taken.
Despite having a bikini-ready body all year round, the singer was still nervous to strip off.
She wrote on Instagram: "So proud to reveal my PETA advert. It was a nerve wracking but brilliant experience for something I really believe in".
Alex has recently been filming for The X Factor in Nigeria and has been working on some new music too.
Now that she is also fronting PETA's "Naked" campaign, it's clear that the pop star has no intention of taking a break from her busy schedule and is keen to prove just how committed she is to all of her business and charity ventures - no matter how many there are!
Would you ever pose nude for charity? Let us know below, as the best comment each week wins £50!