Mark Salling from "Glee" drank his face off at Skybar in Hollywood last night -- but even though he was loopy ... he KNEW not to get behind the wheel.
Salling was letting loose after a pretty hectic week at the office -- and dude celebrated his first day off in three weeks by partying with a bunch of friends ... who ALL insisted on keeping the streets safe by cabbing it home.
Finally ... a celebrity making a SMART decision after midnight.
1/25/2011 4:50 PM PST BY TMZ STAFF
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