Rocker Adam Lambert and his mother Leila Lambert will be honored by Parents, Families and Friends of Lesbians and Gays (PLAG) at their Sunday The LA Event in Beverly Hills, California.

In June, Leila and Betty DeGeneres, mother of chat show host Ellen DeGeneres, marched side-by-side wearing matching red PFLAG t-shirts at the West Hollywood Gay Pride Parade.

“Look how sweet!” Adam messaged along with a photo to his more than 1 million Twitter followers. “My beautiful mother Leila marching in the Gay Pride Parade for PFLAG (that's Ellen's mom to the left!).”

At last month's Equality Awards fundraiser for Equality California (EQCA), the state's largest gay rights group, singer Sam Sparro presented Adam Lambert with the group's Equality Idol Award.

“Over the past couple of years since American Idol I've recognized my responsibility as a gay man in the public eye and that's something that I'm really thankful for,” Lambert said in accepting the award.

(Related: As Sauli Koskinen looks on, Adam Lambert sings duet with Kathy Griffin.)