Leonardo DiCaprio, Tobey Maguire, Zac Efron, Selena Gomez, Ellen DeGeneres, Jonah Hill and Joseph Gordon Levitt are among the celebs who appear in the new "Vote 4 Stuff" PSA encouraging young Americans to vote in the upcoming presidential election.

"This is one of the most important elections of our lifetime," DiCaprio says. "We are using the power of social media throughout the Vote 4 Stuff campaign to incite bipartisan conversation around real issues, encourage registration and voting in November." Leo's production company, Appian Way, is a sponsor of Vote 4 Stuff, and he's participated in previous voter PSAs and is a vocal supporter of President Barack Obama.