Kristen Stewart ex-gal pal St. Vincent will perform at the Oscars. (Photo: Bang ShowBiz)

St. Vincent will perform at the Oscars, but that could proved to be awkward! Kristen Stewart is likely to be in the audience. She once dated the singer-songwriter but has since moved on to model Stella Maxwell.

If Kristen attends the ceremony Sunday (Mar 4), Stella could possibly be by her side.

St. Vincent, 35, real name Anne ‘Annie” Clark, will perform with Sufjan Stevens on his song “Mystery Of Love.” The tune is from Oscar contender “Call Me By Your Name” soundtrack.

Chris Thile and instrumentalists Moses Sumney, Casey Foubert and James McAlister will be on stage with Clarke at the ceremony.

St Vincent has been busy since her breakup with Stewart. She just released her fifth studio album Masseduction to critical acclaim. She toured with Stevens in 2006.

The Oscars headliners also includes Mary J. Blige, who is up for Best Supporting Actress for her role in “Mudbound.” She’ll perform her nominated song “Mighty River” from the Dee Rees-directed drama movie.

Blige is the first performer in Oscar history to be nominated for a performance and original song in the same awards season.

Rapper-turned-actor Common will perform with Andra Day on the track “Stand Up For Something,” from the biographical legal drama “Marshall.”

Gael García Bernal, Natalie LaFourcade and Miguel will perform “Remember Me” from the Disney movie “Coco.”

Keala Settle will sing the title track from “The Greatest Showman.”

St. Vincent began dating UK model Cara Delevingne in 2015. But a year later, she was spotted with Stewart. They dated for little less than a year.

Clark says she’s neither straight nor gay.

“I don’t think about those words. I believe in gender fluidity and sexual fluidity,” she told Rolling Stone, echoing a lifestyle adopted by a number of celebrities.

“I think you can fall in love with anybody. I don’t have anything to hide but I’d rather the emphasis be on music,” she said.

Clark, who lives in New York City, has been described as intensely private about her personal life.

Check out her video below.