Chrissy wasn't given a verbal intro as she took the stage at the host-less awards show, so some fans didn't realize it was her at first. The 39-year-old actress and singer appeared on stage wearing a flowing black gown with a sparkly cape and long hair extensions.
Fans have seen a little bit of Chrissy's singing voice on This Is Us. Her character, Kate Pearson, showed off her chops in a few episodes of the NBC drama as she tried to make a career as a singer. But the soundbites on the show seemingly didn't do Chrissy's voice justice.
In the comments section of ABC's YouTube video of the performance, some fans couldn't believe what they were hearing.
"Damn! I didn't know she knew how to sing... this girl has pipes," one commenter wrote.
"Holy crap! I had no idea she was such an amazing singer," another added.
"I am blown away her beauty and voice, I have no words. Perfection," complimented a third user.
"Chrissy's singing took my breath away and she looks AMAZING in that gown," a fourth fan added.
Many commenters thought Chrissy's musical performance was the best of the night, beating out Elton John, Eminem, and Idina Menzel, among others.While Chrissy impressed viewers with her surprising performance of the Oscar-nominated song, she almost didn't get the gig in the first place. During a red carpet interview with E!, "I'm Standing With You" songwriter Warren admitted Chrissy wasn't her first pick to perform the song. She admitted she actually left the studio when Chrissy showed up to rehearse and record, but when she returned she couldn't believe her ears.
"I was blown away," Warren said of Chrissy's voice, per People. "I didn't want her originally for the song, I wanted a more established artist, I didn't realize she could sing. When I heard her on the song, [I was just] blown away."
Warren scored her 11th Oscar nomination for the song, though she ultimately lost in the Best Original Song category to Elton John's Rocketman tune, "(I'm Gonna) Love Me Again." Chrissy certainly won over a whole new audience with her epic live performance, however.
The This Is Us actress previously told People that never in her "wildest dreams" did she think she would ever be singing a Diane Warren song at the Oscars.