+ Selena Gomez
We loved her with The Biebz, but maybe it's time for Selena Gomez to date an older man. Aside from being absolutely gorge, the "Come & Get It" singer is one of the sweetest girls in Hollywood, and no doubt would make a good GF. Seriously, though, has she ever said or done anything mean? Selena recently Tweeted her support for 16-year-old girls' education activist Malala, who was shot in by the Taliban last year and nominated for a Nobel Prize this year.
+ Nina Dobrev
Nina Dobrev's ex Ian Somerhalder is handsome as hell, but has to keep his skin pretty pale since he plays a vampire on "The Vampire Diaries." If it's a tan man she's after, Zac Efron's Nina's guy. Nina's a spokesperson for Project Pink, an org devoted to raising breast cancer awareness and supporting the one in eight women in the world who have the disease.
+ Kate Upton
Is there any straight man on Earth who doesn't wanna date Kate Upton? If Zac's looking to figure out if blondes really do have more fun, maybe he should hit her up. We already know the Victoria's Secret model loves to play office — for charity. She recently hosted Cantor Fitzgerald's annual 9/11 Charity Day, helping to raise millions of dollars for over 100 philanthropic organizations around the world.
+ Katerina Graham
Over 1 billion people in the world lack access to clean, safe drinking water. That's why "The Vampire Diaries" actress Kat Graham supports The Water Project, an organization that brings water and water wells to people in need. If Zac were to hang with Kat, we're sure he'd need her like he needs water.
+ Vanessa Hudgens
It's been years since "High School Musical" co-stars Vanessa Hudgens and Zac Efron broke up. They've both grown up, and maybe they can work out whatever issues they had back in the day. If you're having trouble getting over an ex, check out MTV's Half of Us for helpful tips and resources. Click the Half of Us link below to learn more.