03/11/2008 AT 11:55 AM EDT
T.R. Knight, Portia de Rossi and Ashanti are just a few of the celebrities that have lent their voices – and support – to a new anti-hate video for Logo
, prompted by the murder of 15-year-old Lawrence King, whom friends say was killed because he was gay. "Imagine if wearing makeup or a dress could get you killed," de Rossi says at the beginning of the powerful clip. Adds Ashanti: "When you see someone being made fun of for who they are or how they look, do something about it." And Janet Jackson
adds a poignant coda at the end, saying, "None of us are safe until all of us are safe."