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Lauren Jauregui and a hot brunette put in some hardcore hours -- partying together all over NYC from daytime, into nighttime ... straight into Thursday morning.
Jauregui and the mystery chick started their party adventure at her hotel ... they were spotted walking out of it Friday afternoon. They hit up a bar in the East Village ...then a house party, and eventually 1 OAK Nightclub.
And they still weren't done. The mobile party kept rolling at Soho House ... where they eventually emerged at 6 AM Saturday.
One of Lauren's friends posted an image on his Instagram story of Lauren and the brunette in bed together... but deleted it minutes later.
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Unclear who the lady is, but she obviously doesn't have issues with Lauren's party lifestyle, unlike ex-girlfriend Camila Cabello.
