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Sinead O'Connor

Steve Granitz/WireImage

It appears somebody's feeling a bit nostalgic.

Just when we had kinda, sorta gotten used to seeing Sinead O'Connor with a fuller, darker head of hair (and quirky look all-around), the singer popped up to perform at the amFAR Inspiration Gala in Hollywood last night with a brand new 'do.

Actually, make that an old 'do, given how it's practically identical to the one the singer famously sported in the early '90s, most memorably in the music video for her hit "Nothing Compares 2 U."

Decked out in a form-fitting purple slip dress, the 44-year-old Irish songstress also showed off a large Jesus tattoo plastered on her chest.

The pope would be proud.