You know you've made it as a country star when you're headlining the 18th annual Testicle Festival in Oklahoma.
Miranda Lambert is set to perform tomorrow at the four day event in Stillwater -- where there will be enough beer, music and fried bull balls to last you a lifetime.
No word if there are any sack races at the event.
** Follow TMZ on Twitter -- CLICK HERE to check out our new page! **