Halloween has come early for Fifth Harmony, because these girls are getting downright spooky on their latest song.

The 5H girls -- Ally, Normani, Camila, Dinah and Lauren -- have just released their brand-new track, "I'm In Love With A Monster," which will be featured in the upcoming "Hotel Transylvania 2" movie (out Sept. 25).

Giving us some serious "Monster Mash" throwback vibes, the Harmony Samuels-produced track is filled with deep, heavy beats, trombones and drums over an almost creepy base.

The girls voices are, of course, on-point, as they trade verses singing about a guy, who is, well... a monster. He treats them bad, but they just can't seem to let him go.

"Wrap me in leather before you wrap me in lace/ We breaking rules like we changing the game/ He's trying it on, and he's ticking me off/ Say what you want but I won't ever be told/ I'm in love with a monster," the girls sing on the track.

On the chorus the girls chant, "I'm in love with a monster," before asking the question at the end of track: "Are you in love with monster?"

Besides the new song, Fifth Harmony are also celebrating the fact that their single, "Worth It," has gone double platinum. Congrats, girls!