Zac Efron recently went to a Slightly Stoopid concert in Hollywood where sources say he was flirting with fellow concert goers. Insiders say the 20-year-old High School Musical star was mobbed by ‘њgorgeous girls’ќ who all gave him their phone number. Efron is currently dating actress Vanessa Hudgens, but didn’t mention that fact as the girls fought for his attention.