It was a very special Friday for the youngsters at a children's hospital in Nashville, Tennessee.

Not only did Ryan Seacrest turn up to open his 10th Seacrest Studio, a state-of-the-art, multimedia broadcast facility designed to help young patients get well.

But he also brought surprise guest Taylor Swift with him, much to the amazed delight of the kids and their parents at the Vanderbilt University Medical Center's Monroe Carell Jr. Children's Hospital.

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'Surprise of the century?!' Ryan Seacrest posted this selfie with Taylor Swift on Monday at the opening of his 10th Seacrest Studio at Vanderbilt University Medical Center's Monroe Carell Jr. Children's Hospital

The 26-year-old pop superstar looked fabulous in a blue, fit and flare mini-dress with vertical black stripes emphasizing her slender shape.

Her blonde hair was smoothed into a sleek bob and she wore her trademark red lipstick as she and Ryan grabbed a large pair of scissors and cut the blue ribbon together, declaring the studio open.

The smiling 41-year-old radio and TV celebrity was dressed in black from head to toe in a leather jacket, shirt and trousers.

Then she teamed with the American Idol host inside the new 723-square-foot studio for its first broadcast.

It's a snip: The 26-year-old pop star and the 41-year-old radio and TV celebrity wielded a giant pair of scissors as they cut a ribbon and declared the new facility open

Mixing and mingling: Afterwards the American Idol host happily took selfies with young patients, their families, doctors and nurses at the facility

'It was thrilling to have Taylor surprise the patients, which made the day of our first broadcast at Vanderbilt even more special,' Ryan dished to People.

Taylor added: 'I just want to say thank you to Ryan for everything that he's doing to help kids and to really change the hospital experience in the best way possible.'

Ryan, Taylor and the hospital took to Instagram to post a slew of pictures from the event.

Talking it up: Ryan explained the state-of-the-art, multimedia broadcast facility is designed to help young patients get well by encouraging them to create content to air in the hospital. Then Taylor teamed with the American Idol host inside the 723-square-foot studio for its first broadcast

Love the posters: 'Check these out,' Ryan gushed on Instagram. 'Gonna have to keep one for my office'

The funniest was probably an eight-second video that Ryan shared showing him with fellow DJ and rocker Bobby Bones.

Bobby said: 'We're in Nashville opening up another great, great Ryan Seacrest studio for the kids and I...' before becoming seemingly lost for words and landing a smacker on the celebrity's cheek.

Other shots showed Ryan with a special poster advertising the studio opening and he and Taylor surrounded by fans, happily posing for selfies.

The Ryan Seacrest Foundation is a non-profit organization dedicated to inspiring today’s youth through entertainment and education focused initiatives.

Puckering up: 'Good luck smooch from my man @mrbobbybones before opening #SeacrestStudios 10'