Katy closed the show with a unique rendition of her song Firework in Washington DC, which ended with Biden and vice president Kamala Harris watching a stunning fireworks display from the White House.
However, Chrissy has admitted that after the performance, she ended up making quite the faux pas while chatting to Katy.
Playing a game with US talk show host Jimmy Fallon, Chrissy revealed: “I was so scared because we ran into Katy Perry after, and I always say dumb things.
“I always get so nervous, and I say faux pas, and then I hadn’t seen Katy for so long.”
Trying to compliment the chart-topping star on her performance, Chrissy told her: “Oh, I typically hate fireworks, but that was like amazing, that was beautiful.
“I think she heard that I said I hate Firework, like the song,” Chrissy said. “I wanted to die, I felt so bad. ‘No, no, no, not Firework’.”
During the same interview, Chrissy recalled mistaking Oscar nominee Michael Keaton for a waiter when she bumped into him at the Golden Globes a few years ago.
“I was drinking a lot and I saw somebody at the entrance holding a glass of champagne,” she recalled.
“I just went up and took it and I said, ‘thank you’. And John goes, ‘that was Michael Keaton’.”
Chrissy isn’t the only star to have suffered an embarrassing blunder while dealing with another celeb, though.