American Idol runner-up John Foster thrills fans at Cajun Country Jam 2025 with selfies, country classics, and his first public performance since the finale

American Idol Season 23 runner-up John Foster made a powerful impression during his first post-Idol public performance at the Cajun Country Jam Memorial Day Festival in Denham Springs, Louisiana. The 18-year-old singer from Addis instantly connected with fans, bringing both star power and southern charm to the event.

While performing Alan Jackson’s timeless hit “Don’t Rock the Jukebox,” Foster delighted the crowd by stepping off the stage to take selfies with hundreds of fans, turning the festival into an unforgettable celebration of music and community.

A Country Voice Beyond His Years

Despite being new to the professional scene, Foster’s voice carried the soul and authenticity of a seasoned performer. Fans and critics alike praised his ability to deliver classic country vocals with youthful charisma.

“This guy sounds like he’s been doing this for decades,” one festivalgoer said. “He made every person in that crowd feel seen.”

Surprise Sets and Special Offers

Foster kept the energy high throughout the weekend, popping in and out for surprise sets — just as he promised in a video shared by Cajun Country Jam’s official Facebook page. Festival organizers even offered half-price tickets using the promo code FOSTER to celebrate his appearance.

Watch the full video below.

From Idol Stage to Country Star

Still just 18, Foster has already shared the spotlight with Miranda Lambert and performed a show-stopping duet with Luke Bryan during the Idol finale. His blend of humility, passion, and undeniable talent is earning him a place among the genre’s most exciting young voices.