The 42-year-old actress – who plays Julia Montague in the hit BBC drama – looked stunning in the unearthed images taken in 1995 and 2000.
Reclining on a table, the star, then approximately 19 years old, stared directly at the camera in the mid-1990s shoot.
Keeley, who first appeared on TV in 1989 in ITV series Forever Green, donned suspenders in another image taken in a car.
She sported a slightly shorter bob to that of her Home Secretary character.
A further photo from 2000 sees then roughly 24-year-old actress – who has also appeared in Line Of Duty and The Durrells – wear a yellow negligee in a colourfully-decorated room.
It comes as David Cameron was forced to deny claims that he appeared in a picture with Keeley for a scene in the Bodyguard.
The show's set designer, Matthew Clark, joked on Twitter that they asked the former PM to pose for the 'Death Star' picture – and then edited in the actress afterwards.
In the show, the picture showed her standing between David and NATO Secretary General Anders Fogh Rasmussen.
But the original image featured Denmark's Prime Minister Helle Thorning-Schmidt in the middle of David and Anders.
Matthew wrote: "Fun fact: Keeley Hawes is *such* a national treasure, we got David Cameron to pose for this photo and photoshopped him in to match her, rather than the other way around."
Jim Waterson, the media editor of The Guardian, was determined to find out the truth and called the former PM's office for clarification.
He wrote on Twitter: "David Cameron's office says this is not true, he hasn't posed for Bodyguard and point to this original photo.
"Doing my best to bring you all the very important news!!!"
He added: "It's been all over my timeline with people thinking it's serious.
"Even on some websites. So I thought I'd just email and ask if he was a fan."
Meanwhile, Bodyguard creator Jed Mercurio has dropped a massive hint that Keeley's character is alive.
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