Country-pop powerhouse Kelsea Ballerini received a surprise of a lifetime at her recent show in Los Angeles, California.

The singer-songwriter is currently on her 10-night-only headlining HEARTFIRST Tour, and during her stop at the Greek Theatre, Chesney made a guest appearance to perform their No. 1 duet "Half of My Hometown."

The 29-year-old hitmaker was experiencing "tracking issues," leaving her to create a mashup of "Love Is A Cowboy" from her recently released fourth studio album and "Cowboy Take Me Away" by The Chicks. Following the rendition,  Chesney nonchalantly snuck up behind Ballerini and surprised her.

His presents visibly caught the songstress off guard. As excited concert-goers filled the venue with hoots and howlers, Ballerini was captured kneeling down.

"Hey, Los Angeles, I'm Kenny. Good to see you guys!" said the eight-time Entertainer of the Year and fellow East Tennessee native.

While many musicians have a hand in coordinating their show lineup and cameos, Ballerini's team managed to pull off the shocking surprise without her help. According to Country Now, the two-time GRAMMY-nominated artist uttered, "what the f**k" while Chesney introduced himself to the rowdy crowd.

Before exploding into the fan-favorite collaboration, the two shared a warm embrace under the spotlight. Shortly after the chill-provoking performance, Ballerini addressed the audience and confirmed that she was not expecting Chesney.

"I'm really hard to surprise because I ask a lot of questions," she explained. "I swear…NO IDEA."

While wrapping her head around the unforgettable evening, the "Subject To Changer" singer shared a handful of snapshots from the live show.

"Half of my hometown showed up in Los Angeles last night. @kennychesney WHAT  A SURPRISE  IM STILL LOSING IT?!?" Ballerini wrote alongside heartwarming photos. "Singing 'Half Of My Hometown' with Kelsea is always magic because she grew up where I did... and she knows all those places, too. So proud of her, especially at the Greek last night," shared Chesney in a statement.

This is not the first time Chesney and Ballerini delivered the chart-topping hit live. Ballerini joined the crooner on stage in late May during his sold-out show at Nashville's Nissan Stadium. Before they shared the sentimental single, Chesney explained why he wanted to record "Half Of My Hometown," which lives on Ballerini's 2020 album "Kelsea."

Ballerini penned the hometown anthem alongside critically acclaimed songwriters Shane McAnally, Jimmy Robbins, Nicolle Galyon, and Ross Copperman. "Half Of My Hometown" made its live debut at the 2021 ACM Awards. The smash hit served as Ballerini's seventh No.1 and Chesney's 35th.

Although Ballerini's nationwide trek is short, it has been full of memorable moments thus far. In early October, Carly Pearce flew to Chicago to join the hitmaker on their recent release "You're Drunk, Go Home," which also features Kelly Clarkson. Nicolle Galyon also stepped in during a show at The  Midland Theatre in Kansas City. The must-see run is quickly coming to an end, as she will be wrapping up at Connecticut's Foxwoods Resort Casino this weekend, Oct. 14.