The This Morning host was covered in silver body paint to pose for the ad campaign promoting Oral B.
"I love working with Rankin and couldn't wait to do something totally different to how I'm normally seen," said Holly.
"It was a great experience to see yourself as you never have before. It took about two hours to get paint on, shine applied and a tiny bit of sculpting to my face.
With her trademark blonde tresses slicked back, Holly, 32, strokes a sultry over-the-shoulder pose in one shoot. Another sees her opening her mouth slightly to reveal pearly white teeth.
The silver paint was applied to Holly using baby oil and a spray gun filled with silver paint, while a darker silver pigment was used to contour her face.
Rankin has worked with countless celebrities including supermodel Kate Moss.
Mother-of-two Holly, who is married to TV producer Dan Baldwin, recently joined forces with her sister Kelly to write their first children's book, which follows twins Molly and Maria as they start their first term at drama school.
Holly was a natural choice for Oral B, having topped their recent 'Best Celebrity Smile' poll.
The blonde beauty recently revealed that she gets her fashion inspiration from German supermodel Heidi Klum.
"Heidi Klum has a beautiful open face, big bright eyes and big white shiny smile – she just looks very beautiful," she said.
"She seems happy in her own skin, so someone like her is iconic."