Teenage girls everywhere can breathe a huge sigh of relief. Zac Efron is doing fine. The High School Musical star was rushed to Cedars-Sinai Medical Center on January 15 for an emergency appendectomy. “Zac had his appendix removed and is recuperating,” his rep tells In Touch. Hopefully Zac, 20, will have a speedy recovery. The young heartthrob is filming Seventeen, a comedy co-starring Michelle Trachtenberg, and just inked a deal to reprise his role as Troy Bolton in the third installment of the mega-hit movie High School Musical.