As if One Direction singer and teenage-heart exploder Harry Styles needs another excuse to take his shirt off -- but he did it anyway last night ... to pump his skin with ink.
18-year-old Styles -- who already has several tats -- stripped down at Shamrock Tattoo in West Hollywood for the new ink job ... while a crowd of girls ogled him from outside.
According to reports, Harry's tat session consisted of sparrows and a couple of stars.
The British boy band is currently in L.A. for a special performance on "X Factor" tonight.
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