Getty / Def Jam Recordings Composite

It's one swaggy summer for Beliebers ... 'cause Justin Bieber just announced his 8th studio album, "Swag II."

The pop star shared the exciting news via a flurry of Instagram posts Thursday morning that show the album's name advertised on billboards across the world ... from New York to London to Shanghai and beyond. Instagram / @lilbieber

The best part? Fans won't have to wait long ... the new music is dropping Thursday night at midnight. Instagram / @lilbieber

As you know, this album follows the surprise release of "Swag" in July, which features songs such as "Daisies" and "Go Baby." Play video content

That album covers a range of topics ... from candid lyrics about Justin's marriage highs and lows, to his innermost thoughts

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