MEGA Jennifer Aniston is always popular in swimwear, to the point where one of her bikini photos has been dubbed “one of the best pictures ever.” The 57-year-old, who continues to make headlines for defying her age, had fans gushing over a vacation snap of her three years ago, with the image dating back to 2010. Soaking up rays on a sun-drenched terrace sixteen years ago, Jennifer flaunted her stunning figure in a skimpy, mismatched bikini, goin…