Marc Malkin

Silence will be golden tomorrow for T.R. Knight.

The openly gay Grey’s Anatomy star has just signed on to participate in the National Day of Silence ceremony at the Miguel Contreras Learning Complex in Los Angeles.

Sponsored by the Gay, Lesbian and Straight Education Network (GLSEN) to help combat bullying and harassment of gays in schools, the day is marked by students across the country taking vows of silence during the day.

This year’s 12th annual programming—most of which takes place on Friday—is dedicated to Lawrence "Larry" King, a 15-year-old California boy who was shot to death in February by a fellow student, allegedly because King was gay.

I can also exclusively tell you that talk-show host Larry King is getting involved, too.

Just last night, he took a break from his live coverage of the Pennsylvania primary to film a public service announcement for GLSEN and the Day of Silence.

“Larry King and I share more in common than just our names,” King says in the spot, which debuts on YouTube today. “We both believe that all students should be free to be themselves without the fear of name calling, bullying or harassment.”

GLSEN president Kevin Jennings tells me that King immediately agreed to participate when they contacted him. “Larry King helps us reach the kind of mainstream audience he speaks to every night,” Jennings said. “I don’t necessarily see this as a YouTube phenomenon, but I see this reaching a much more traditional audience.”

King’s PSA shoot comes just days after Lance Bass filmed one. “Whoever they are, whatever their backgrounds or beliefs, these students will take action because they believe that the bullying and harassment must end,” Bass says in his spot. “What are you going to do to end the silence?”