4minute's HyunA is becoming a hot topic with her latest selca. On November 25th, HyunA posted a few selcas through her Twitter, as she explained, "Go go rehearsal." The selca-addict shared a picture from the rehearsal room at the MGM Grand Garden Arena in Las Vegas, where she and her fellow 4minute members are patiently waiting for their time on stage. HyunA appears to be wearing little to no makeup, which has netizens complimenting her on her flawless skin. Comments included, "Really pretty. Perform well and come back soon!", "Even from the morning, you are so busy. Fighting!", "Your eyes look puffy. I hope you get some rest while working." 4minute will be performing alongside other K-Pop stars at the '2011 Billboard K-POP Masters' concert in Las Vegas on November 25th and 26th. Source: OSEN