Justin Bieber's Hamster Living Like a GOD With New Owner

FEAR NOT JUSTIN BIEBER FANS ... his former pet hamster (ya know, the one he gave away) is now living in the lap of luxury with its new owner ... who has vowed to treat the little guy like a tiny rodent king!!!

TMZ broke the story ... Bieber unloaded the furball -- named PAC -- on an unsuspecting fan after his Jingle Ball performance in Atlanta last week -- and now we've learned that fan COULDN'T BE HAPPIER.

We spoke to 18-year-old Tori -- huge Bieber fan -- who tells us she was shocked when the Biebs randomly offered her the cage ... but is excited about looking after the lil' guy and assures us he's in great hands.

Tori tells us ... both she and PAC are living happily together at her home in Alabama ... and she plans on keeping her new furry friend as long as Bieber says it's cool. 

Calls to PAC have not been returned ... because he's a hamster.