Zoe Saldana, Josh Hutcherson and Nina Dobrev are among stars who've appeared in a new PSA for the White House It's On Us campaign, supported by President Obama and Vice President Biden, which intends to raise awareness around preventing sexual violence on university campuses.

The PSA, The One Thing, focuses on the importance of consent and also features John Cho, Haim, Minka Kelly, Jessica Szohr, Jesse Metcalfe and Matt McGorry, and states 'There's one thing you can never have sex without. It's not something you buy or something you take. In fact there's only one way to get it. It has to be given to you freely. It's consent. Because sex without it isn't sex, it's rape. Consent: if you don't get it, you don't get it'.