Before Demi took to the stage, the singer and actress was in good spirits, tweeting to her fans: 'So excited to sing the National Anthem at game 4 of the World Series tonight!!.'
Belting out the notes, Demi seemingly put her whole heart into it, but was still met with criticism.
Make-up free, the young star appeared down in the dumps, keeping her head down as she made her way through the terminal at LAX airport.
The blonde had changed for her flight home, wearing a black lace dress underneath a flannel shirt and leather jacket.
