Taylor Swift is loving the new Fall Out Boy song, called "Light 'Em Up" or "My Songs Know What You Did In The Darkk."

She's loving it so much that shes repordedly listening to it 43X a day alone....

The name varies from radio format to radio format. Some formats call the song LIGHT EM UP since that's faster and easier to say over an intro of a song than the song's real name is... which is the longer "MY SONGS KNOW WHAT YOU DID IN THE DARK." 

The singer even went to twitter to express how much she is enjoying it >>> 

Check out the song here and let us know what you think....Would you listen 43X ???