Whoa, YoonA has now become the quickest female idol to reach 1 million followers on Instagram!

The last member of Girls' Generation to join back on September 27, YoonA has become an Instagram millionaire in a matter of five days, which is incredibly fast - and with only 4 photos uploaded to boot.  Looks like fans have been waiting forever and a day for her jump on the SNS bandwagon.

Congratulations to YoonA!  Make sure to follow her @yoona__lim.