Taylor Swift is known for keeping concertgoers on their toes, frequently surprising fans with guest performances - having recently been joined onstage by model pals Gigi Hadid and Martha Hunt, and Imagine Dragons' Dan Reynolds.
But the surprise guests at the 1989 show in Pittsburgh on Saturday were particularly special, as they brought the 25-year-old back to her country roots.
She was joined onstage by country group Little Big Town, and together they sang the group's single Pontoon.
Scroll down for video
Surprise! Taylor Swift revisited her country roots on Saturday as she was joined onstage by 1989 Tour guests - and country group - Little Big Town for a show in Pittsburgh, Pennsylvania
She famously hopped over to the pop genre for her record-breaking 1989 album this year, but Taylor rose to fame with her chart-topping country singles.
The star was recently honored with the 50th Anniversary Milestone Award at the American Country Music Awards for her accomplishments in the genre, such as her eight previous ACM wins and being the youngest to ever take home the entertainer of the year award, collecting it at just 21.
For the performance Taylor showed off her toned midriff and $40m pins in a coordinating, bedazzled white crop top ensemble.
The hitmaker coupled the sparkling costume with a pair of daring, black thigh-high boots, and of course sported her signature red lipstick.
As she was joined onstage by the country group, Taylor danced and sang along to the upbeat, summery single, while backup dancers carrying inner tubes and dressed in bathing suits flooded the stage.
All that glitters: The blonde beauty showed off her toned figure in a two-piece crop top ensemble and thigh-high boots
Sing-along: Taylor joined the group as they performed their single Pontoon
She sporadically pumped up the crowd, with questions such as: 'How does it make you feel that Little Big Town wanted to come here to surprise you tonight?'
Following the lively performance, Taylor took to Twitter, excitedly sharing: 'Tonight my friends @littlebigtown surprised the #1989TourPittsburgh crowd with 'Pontoon' and it was SO MUCH FUN!!'
She had tweeted her excitement initially that night, as the concert took place in her home state of Pennsylvania.
Setting the mood: Though it was a surprise, one-stop performance, Taylor kept it theatrical, with bathing suit-clad dancers joining the group onstage with beach balls and inner tubes
Popular: Taylor tweeted her excitement over the surprise on Twitter, writing: 'Tonight my friends @littlebigtown surprised the #1989TourPittsburgh crowd with 'Pontoon' and it was SO MUCH FUN!!'
Happy to be home: Saturday's show took place in the state where Taylor was born, and the star couldn't help but share her excitement, writing: 'Getting ready for #1989TourPittsburgh !!!!! BACK IN THE HOME STATE'
Taylor wrote: 'Getting ready for #1989TourPittsburgh !!!!! BACK IN THE HOME STATE'
The statuesque beauty also sparkled in another midriff-baring number as she continued to wow the Pennsylvania audience.
She donned a shimmery black crop top, which she coupled with a high-waisted, short purple skirt and coordinating black boots.
Taylor finished off her glitzy look with a shiny, silvery jacket as she thrilled the 55,000 guests at Heinz Field.
Showstopper: The blonde beauty showed off another glitzy number as she hit the stage in a sparkling black crop top and glittery purple skirt, flaunting her $40m legs
Hard at work: Taylor pulled out all the stops for the crowd of 55,000 that joined her at Heinz Field on Saturday
Fan friendly: Taylor later posed backstage with Dance Moms star Maddie Ziegler, who took to Instagram to write: 'You're the sweetest! So happy i got to meet up with you again!'
After the show Taylor was spotted posing for photos alongside Dance Moms star - and Sia muse - Maddie Ziegler, sporting a sparkly, pink fringed dress.
She was then joined by Fight Song singer Rachel Platten, up-and-coming country artist Kelsea Ballerini, Little Big Town, and Vance Joy for a jam session backstage.
First the girls sang along as Vance played a few of Blink 182's popular hits. However, the blonde beauty was so excited that she mixed a few of them up, which resulted in a fit of giggles.
Taylor captioned the video: 'When you love Blink 182 so much that you're paralyzed by it and mix up their songs.'
Oops! Taylor made fun of herself as she shared a video on Instagram, noting: 'When you love Blink 182 so much that you're paralyzed by it and mix up their songs'
She's a fan! After the show Taylor was joined in her dressing room by Rachel Platten, Kelsea Ballerini, Vance Joy, and Little Big Town, where they all had their own jam session
THIS IS MY FIGHT SONG @rachelplatten @kelseaballerini
Next she threw it over to Rachel in a video emphatically captioned: THIS IS MY FIGHT SONG,' wherein she playfully suggests 'We're gonna rage this time,' as the group reaches the upbeat song's chorus.
Things get a lot sillier from there, as Little Big Town is up next, singing Girl Crush in Taylor's dressing room.
The girls show off a series of strange dance moves, and begin playfully stroking each other's faces until they just can't handle it and break into another fit of giggles.
![Admirers: Rachel shared a sweet message about Taylor along with this photo, writing: 'This amazing woman represents everything #myfightsong is about: [heart emoji] you @taylorswift (& cutie @kelseaballerini :)))'](https://cdn.statically.io/img/i.dailymail.co.uk/i/pix/2015/06/07/18/296D696100000578-3114404-image-a-45_1433696996924.jpg)
Admirers: Rachel shared a sweet message about Taylor along with this photo, writing: 'This amazing woman represents everything #myfightsong is about: [heart emoji] you @taylorswift (& cutie @kelseaballerini :)))'
Her turn! Next, up-and-coming country singer Kelsea Ballerini played her song Yeah Boy, a tune Taylor initially tweeted her support of back in March
Supportive: Taylor shared the video, in which she sings right along to Kelsea's tune, praising the musician as she called Yeah Boy her 'EVERYTHING'
'When Little Big Town is singing Girl Crush in your dressing room, there is no other option but interpretive dance,' Taylor writes.
Finally, Kelsea performed her song Yeah Boy, which Taylor has already publicly shared her support of, tweeting this March: 'Driving around with the @KelseaBallerini EP on repeat.. SO lovely:)'
And last night she took it to another level, as alongside a video of her singing along to jam Yeah Boy, she wrote: 'Petition for 'Yeah Boy' to be @kelseaballerini's next single because it is MY EVERYTHING.'
Taylor will continue on with her 1989 Tour with Monday's upcoming performance at the Time Warner Cable Arena in Charlotte, North Carolina.
Petition for 'Yeah Boy' to be @kelseaballerini's next single because it is MY EVERYTHING.
ncG1vNJzZmivp6x7pa3IpbCmmZmhe6S7ja6iaKymqLWww8GisWiZoqm2pLjEZmpqaWRpfXV7s5qwpaeiYqC4tcWtZKaZm5rAbr%2FUq6eroaOaerGx0Z%2Bmq6WRo7CmecKorKesoq56qL7OrqdmhJmpwa2xjHugoGWEpMSvea%2Biq62rkqq%2FqLSMrKuoqF1mhnmFjJCmq6SUYqGwwdFnn62lnA%3D%3D