Now we know where Heidi Montag has been hiding ... in the recording studio!

The former Hills star has released a new heavily-synthesized track called Heartbeat. Early last year, the 24-year-old starlet debuted her freshman album Superficial ... an effort that bombed with both buyers and critics.

As for what inspired her with this track, Montag tells People, "I put my heart into this music ... I want to become a galaxy star."

Not sure this song is out of this world. You be the judge.

Check out how many copies of Superficial sold during its first week of release after the jump ...