Demi Lovato may not be friends with Selena Gomez anymore (and she wants to kill Justin Bieber!), but she always has plenty of love for her loyal fans.

On Saturday night the 21-year-old "Skyscraper" singer made her way through Los Angeles International Airport, and even though she was dressed down and wearing glasses and no makeup, she happily posed for photos with the pack of teenage girls following her through the terminal. The previous night Demi appeared on The Tonight Show With Jimmy Fallon in New York City, which could explain the silly sweatshirt she's wearing with the late night host's face emblazoned on the front.

After returning home, it seems as though Demi was feeling rather pensive, as she tweeted, "Sometimes I'm not always doing amazing but it's okay.. because everyone struggles & it's okay to be flawed because that's what makes me.. Me." Hmm, wonder what that's about? Maybe her feud with frenemy Selena Gomez? We asked her -- see her reaction ...