Z STAFF
Justin Bieber was boozing like a college kid during a Rae Sremmurd show … taking a huge swig straight from a bottle onstage in New Zealand.
We haven’t seen the Biebs let loose like this in a while — since cleaning up his act — but during the duo’s gig, Biebs took a dare and chugged from a bottle of Hennessy.
Bieber never totally laid off booze, even though he battled some serious drug issues, but he’s gotta be having some regrets today … or at least a headache.