Jennifer Garner reunited with her close friend and former 13 Going on 30 co-star Judy Greer this week, and despite promising Judy she wouldn't Instagram their reunion, the actress just couldn't resist.

Jennifer – who played school geek Jenna in the noughties comedy while Judy took on the role of clique leader Tom-Tom – shared a sweet selfie of the pair outdoors, both dressed down and wearing face masks.