And it isn't just the two ladies who can feel the chemistry, as Lea Michele's Rachel Berry is quick to play matchmaker. They eventually sing the Beatles classic and share a first kiss.
Their love story already has fans swooning.
"Watched Demi on Glee and X Factor last night. I LOVE HER SO MUCH!" @superstar1121 wrote. "She is literal perfection!"
@nind__ added, "ok usually i dont tweet during glee but DEMI IS FREAKING CUTE CANT HELP IT." @tomlinhaunt had a similar reaction, sharing, "bUT DEMI LOOKED SO HOT ON GLEE LAST NIGHT LIKE DAMN."
Demi is slated to appear on the Fox sitcom for a multi-episode arc, which is likely to pick up when the show resumes its hiatus after the Cory Monteith tribute episode airs on October 10. Judging by the overwhelmingly positive response to Demi's work, fans are excited to see what's next for the couple, who go by "Dantana."
@tweetlecee commented, "demi lovato on glee is almost as good as pumpkin flavoring in beer."
"Demi lovato in glee omfg I love her so much," @SophHeartbeatGA wrote. "and im dead aosndjwoekw."