Dianna Agron: Trevor Live!

Dianna Agron dolls up in an LBD as she arrives at the 2011 Trevor Live! held at The Hollywood Palladium on Sunday night (December 4) in Los Angeles.

The 25-year-old Glee actress joined Neil Patrick Harris, Fergie, and others at the event, which honored Lady Gaga and Google Inc.

The annual event brings together top entertainers and corporate leaders to support The Trevor Project‘s lifesaving initiatives, including its free and confidential lifeline, in-school workshops, educational materials, online resources and advocacy.

FYI: Dianna wore a vintage black Chloe dress and a Roger Vivier clutch.

15+ pics inside of Dianna Agron…