Motley Crue bassist Nikki Sixx and his wife Courtney have officially welcomed their first child, Ruby Sixx.

USA Today quotes Sixx's recent Instagram post, reporting "a spunky little girl with a full head of hair" arrived on July 27.

"We are already sleep training her with a metronome and I got her a pink bass," Sixx added, who USA Today points out is a father again at age 60 after having had a vasectomy.

Sixx’s wife Courtney announced in a separate post that Ruby entered the world after 18 hours of labor.

“My heart just melted and I was instantly head over heels in love as my life changed forever in an instant,” the 33-year-old mom wrote, adding, "I never knew this kind of love existed.

“I am so excited to be a mommy and know Nikki will be the most wonderful daddy ever just as he has been with my four step-children.”

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