Q: Has Justin Timberlake ever written a song about Britney Spears? Now, let's think step by step:
Justin Timberlake and Britney Spears dated in 1999. In 2002, Justin Timberlake released a music video for his breakup song 'Cry Me A River' and featured an actress who resembled his then ex Britney Spears.
The answer: yes.