Adam Lambert's fans have earned a reputation for their fierce loyalty to the "American Idol" star and chart-topping singer. Photographer Christopher Ameruoso experienced that passion first-hand after he and Priscilla Presley published the best-selling book "Shades of Elvis," which features more than 75 celebrities wearing Elvis' personally owned iconic sunglasses, including Johnny Depp, Elton John, Ozzy Osbourne, Snoop Dogg, Robert Plant, Cher, Steven Tyler, Celine Dion and Willie Nelson.

Of all the A-list artists' fanbases Ameruoso heard from, Lambert's was the loudest.

"I was definitely taken aback," Ameruoso tells HNGN. "He said, 'My fans are the most loyal, you'll see,' and a lot of artists say that, but he was right. His fans are absolutely the most supportive and loyal."

Today, HNGN presents exclusive footage from Ameruoso's shoot with Lambert for "Shades of Elvis." Watch it here.

Lambert recently wrapped up a concert tour as the new singer for Queen, and last week it was announced that the flamboyant performer will be a guest judge for "American Idol's" upcoming season, filling in for Keith Urban due to the recent passing of the father of Urban's wife, Nicole Kidman.

During the process of making "Shades of Elvis," Lambert not only impressed the photographer with his talent and humility, but he also made quite an impression on Elvis' former wife Priscilla.

"First and foremost he's very talented," she tells HNGN. "He's a full-fledged entertainer and he isn't afraid to take risks. He's a showman from the inside and out."  

So would The King have been a "Glambert," a name Adam's fans have given themselves?

"Elvis liked anyone who was beyond good at what they did," Priscilla says. "Adam challenges himself. Always striving to be the best he can be at anything he does. He's passionate about his work and it shows. How can anyone not appreciate that in a performer?" 

[Full Disclosure: Michael Q. Bullerdick, HNGN's President & Editorial Director edited Priscilla Presley and Christopher Ameruoso's forewards for "Shades of Elvis"]