Holly donned the little black two-piece at home, ahead of the summer months, before snapping a short video and sharing it on Instagram with fans.
The bikini features a bandeau top and it is embellished with a giant Swarovski bow on the cleavage and one on the bottom. Yep, you heard right, Swarovski crystals. On a bikini. Swoon!
Alongside the photograph, Holly commented: "Suns out, bums out... trying on bikinis today and getting excited for summer! I adore this one! My Swarovski bow bikini, handmade by @beachdollyswim so it's a perfect fit."
Fans of Holly will know that she has lost a considerable amount of weight in recent years - three stone to be precise - thanks to her own healthy eating and regular exercise plan.
The Geordie star has even brought out her own weightloss book, Holly Hagan's 12-Week Body Bible, and this weekend was pictured signing copies of updated versions. The new edition features more recipes and success stories from those who have followed her plan.
In an interview with Reveal, Holly said: "I know myself, when I've looked at diets, a lot of the time they're really complex and foods I've never even heard of before. They can be really difficult, especially for someone like me who still lives at home so I need something quite easy to follow. The exercises are all things that can be done at home – lunges, squats – really simple things that you can just do in your bedroom.
"I've tried every faddy diet out there, absolutely everything. Anything that any magazine wrote about, I've tried it, but It needs to be a lifestyle change. The Body Bible isn't a diet, it's changing you for life, it's setting you up to think this is what I'm going to do forever.
"Yes, I will have a treat now and again and I will go out and have a few takeaways or whatever, but I've learnt the correct way to eat and how much you should be exercising, so now I can maintain that."
Looking good, Holly!