Lovato hilariously went along with the game, though DeGeneres joked she should stick to her singing career.
Hardcore Lovatics/Disney channel fans will remember that this isn't the first time the singer dressed as a princess.
In 2009, Lovato stood next to Selena Gomez in "Princess Protection Program" – though her more recent costume is certainly superior.
After the prize-filled game, the two ladies sat down to discuss the latest in Lovato's life – her documentary and her tour.
After gushing about "Simply Complicated," DeGeneres asked about the big news she has to share with the audience.