Erin Andrews' Boobs -- Too Good to Be True?

This photo of Erin Andrews in a bikini ignited another WAR in the TMZ newsroom ... after one staffer suggested parts of the ESPN reporter were simply too good to be true ... specifically, her massive boobs.

Erin took her gravity-defying twins out for a swim in Miami this weekend ... and while they're definitely spectacular, are they real??

We dug up another cleavage-baring pic from an event Erin attended in 2009 to compare ... and now we just gotta ask ...