"That Christmas Feeling" is a song sung by Olivia Olson. It is played during the montage of Phineas, Ferb, and their friends redecorating Danville into a giant thank you card for Santa Claus on Christmas in "Phineas and Ferb Christmas Vacation!". It is included as the 3rd song in both the Phineas and Ferb Christmas Vacation! MP3 album and the Phineas and Ferb Holiday Favorites album.