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The Trevor Project—a nonprofit aimed at preventing suicide amongst gay, lesbian, and transgendered youth—honored Katy Perry (in Marchesa) at the organization’s Trevor Live event in Los Angeles, where actresses and funny ladies Aubrey Plaza and Amy Poehler also attended in support of the cause. Perry, whose songs like “Firework” are often associated with anti-bullying and pro-tolerance movements, was given the Trevor Hero Award for serving as a positive pop culture role model. Click through the gallery to see more stars at the biggest parties of the week.

The ombre trend is still going strong, and Aubrey Plaza is the latest star to try it out, showing off new lightened ends at the 2012 Young Hollywood Awards in Los Angeles a few days ago. “I had it done for a movie I just shot,” the Parks and Recreation actress told InStyle.com. “I was playing a character with dreadlocks and just left it in. I might get rid of it this week since I don’t feel like myself, but I’m getting used to it!” What do you think of her look? Tell us in the comments!

Plus, see more celebrity hair makeovers we love.

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— Lindzi Scharf