Amanda Bynes had a late night in Hollywood, but instead of a nightclub ... she was at Starbucks -- and, more importantly, she did NOT drive home afterward.
Amanda spent more than 3 hours sitting inside the coffee shop ... talking on her phone and listening to music on headphones -- before finally leaving just after 11PM PT.
A Starbucks employee unlocked the front door to let Amanda out of the store -- but with her face fully covered she had to be led, very carefully, to a waiting SUV.
Amanda got in the back seat.
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