By Meghan Overdeep
Updated Dec 11, 2015 @ 11:15 am
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Henry Lamb/Photowire/BEImages

Long before Dan came along, it was Brandon Walsh who had Serena van der Woodsen's heart.

Blake Lively made us all kinds of nostalgic Thursday night, when she posted an adorable throwback photo (below) of her as a toddler hugging hunky Beverly Hills, 90210 star Jason Priestley.

"#tbt to when Serena Van Der Woodsen and Brandon Walsh were a thing. (Shh don't tell @robynlively)," Lively wrote on Instagram alongside the too-cute snap of her and Priestley (now 46) at the height of his 90210 fame.

Lively's big sister Robyn dated Priestly in the '90s, which is apparently when the future Gossip Girl star made her move. Ryan Reynolds had better watch out!