Now this is an epic #tbt!
She captioned the snap: "#tbt to when Serena Van Der Woodsen and Brandon Walsh were a thing. (Shh don't tell @robynlively 😊😉😝)"
Fun fact: Jason Priestley and Robyn Lively -- Blake's older sister -- dated briefly in the 90s.
Gotta love Blake Lively's sense of humor!
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