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.

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

[Thanks to everyone who sent in the tip!]