Singer Demi Lovato promoted transgender rights while performing her hit song Cool for the Summer during Sunday's Billboard Music Awards.

Lovato's outfit included a symbol used to support gender-neutral bathrooms.

The 23-year-old singer has previously expressed support for LGBT rights. Late last month, she and Nick Jonas canceled several performances in North Carolina to protest passage of a controversial law that prohibits transgender people from using the bathroom of their choice in government buildings, including schools.

“North Carolina's discriminatory HB2 law is extremely disappointing, and it takes away some of the LGBT community's most basic rights and protections,” Lovato and Jonas said in a tweet.

Two North Carolina LGBT groups, Equality NC and Time Out Youth, will receive the proceeds from the sale of a similar shirt worn Sunday by Lovato, according to GLAAD.