7. Zac Efron
As far as we know, Zac Efron hasn’t had a serious girlfriend since he was in a relationship with his High School Musical co-star Vanessa Hudgens. However, we’re pretty sure he’s had a “situation” or two, since then. Efron moved on from High School Musician to star in several movies, including 17 Again, Hairspray and Neighbors. Unfortunately, Efron was out of the spotlight for a while when he went to rehab to overcome his drug addiction. He is now set to appear in the upcoming movie We Are Your Friends, and is scheduled to appear in the movie Dirty Grandpa, in 2016. With his career back on track, maybe Zac will be ready for love again soon.