Could a Britney Spears and Justin Timberlake collaboration be on the pop horizon? Fans seem to think so. The “Baby One More Time” singer, 39, recently shared an Instagram post that featured a very big cat on Tuesday, Aug. 17. What does a very big cat have to do with her ex-boyfriend from the early aughts? Britney captioned the post with lyrics from Justin’s song “Filthy” — and some have interpreted as such as a collab tease.