Even big-deal celebrities will want to sneak a selfie with Vice President Joe Biden at this Sunday's Academy Awards ceremony

Biden will be there to introduce Lady Gaga's performance of her Oscar-nominated song, "Til It Happens to You." Gaga co-wrote the song for "The Hunting Ground," a documentary about campus sexual assault. While there's always the possibility that Biden is one of Gaga's Little Monsters, his best reason for showing up as her opening act is his history as a women's rights advocate. In 1990, then-Senator Biden introduced the Violence Against Women Act to Congress; it was passed in 1994 and changed the way law enforcement handled sexual assault and violence against women.

Lady Gaga has done her own share of advocacy work. She's known as an activist for the LGBT community and joined forces with Vox Media and Intel to curb online harassment with the Hack Harassment initiative.