Britney and Justin were dating at the time.
(She also wore a longer lace gown to the Grammys in 2010, making it something of a signature style.)
So was Jessica paying tribute to the *NSYNC era? Or, since Jess has said Justin often dresses her, did he have Britney on the brain as he prepped for his big reunion? Or was it all just a coincidence? And most importantly, who wore it best? Let us know in the comments!