LeAnn Rimes's Heavenly 30th Birthday Bash

See the star mark her milestone with a life-and-death-themed celebration

ROCK STEADY

"I had so many amazing things happen in my 20s, and I also had a lot of hard lessons to learn. I'm ready to put those lessons into play," LeAnn Rimes, who marked her milestone with an Aug. 18 "Die, 20s, Die"-themed party in Laguna Beach, Calif., tells PEOPLE.