Talk about nostalgia. Justin Timberlake is actually showing Britney Spears some love on Instagram, responding to the "Toxic" singer's sultry dance to his 2018 hit, "Filthy." No, this is not a drill. Spears shocked fans when she posted two videos showing her wearing barely any clothes and twirling around to her "genius" ex-boyfriend's music on Wednesday afternoon. Sporting nothing but a tiny crop top to showcase her abs and even smaller shorts, the pop princess shook her hips and took us back to the early 2000s when the duo was Hollywood's "it" couple. Fans couldn't wait to see if Timberlake would respond and he didn't disappoint.