Zac Efron proved this weekend that his charm definitely has ** limit. On Monday, the actor shared a sweet Message for his girlfriend, model Sami Mir, on Instagram in Ho**r of Their anniversary. In the photo, the couple, who began dating last September, is seen standing on what appears to be a hotel room balcony as Sami snaps Their reflection in a glass door. Zac plants a sweet kiss on Sami's head as she leans back into him. "Happy Anniversary baby :) I love you @samimiro September 5th," Zac captioned the photo. Sami also took to Instagram to share a cute photo of her and Zac, writing, "Time flies when you're having fun. Happy Anniversary baby I love you too @zacefron September 5." The pair's special day comes just a few weeks after they attended their first red carpet event together. They've also shared many adorable moments together on social media.