Alexa, play "Filthy" by Justin Timberlake... 'cause Britney Spears said so. On Wednesday, the pop star took to Instagram to share a video of herself living her best life out in the balcony of her home, dancing and having fun. "This is my version of Snapchat or TikTok or whatever the cool thing you're supposed to do these days!!!!! As you can see I'm not really dancing folks.....