Kylie Jenner/X

Kylie Jenner is proving she's the baddest bitch around ... 'cause she just made her musical debut -- using her King Kylie alter ego!

That's right -- King Kylie is back ... and collabed with Los Angeles duo Terror Jr for a sexy new single, "Fourth Strike."

Kylie shared the breathy song on her official YouTube page and fans can hear her sultry yet crisp vocals toward the end of the song as she croons ... "One strike, two strike, let me get the mood right ... Do it on purpose just to see how it ends." She closes out her verse by whispering "King Kylie." Gallery Launch Gallery Backgrid

As fans know, the makeup mogul is using the song to promote her new nostalgic Kylie Cosmetics makeup launch featuring her colorful it-girl King Kylie aesthetic from the mid 20

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