Phillips, who is battling Jessica Sanchez for the Idol crown, sang 'Stand By Me', 'Movin' Out' and 'Home' on last night's show.
However, Phillips told E! Online that he was worried about his performances.
"I was scared to death," he admitted. "But I went out there and finally loosened up throughout 'Stand By Me' and the rest of the show. It was so, so fun."
Phillips also insisted that he does not feel any real rivalry with Sanchez, saying: "We're two completely different artists and we just wish each other the best throughout our careers."
The winner of American Idol will be crowned in tonight's live finale, which airs at 8/7c on Fox.
> American Idol poll: Do you want Jessica or Phillip to win?