Singer Justin Timberlake poses for photographers upon arrival at the Brit Awards 2018 in London, Wednesday, Feb. 21, 2018. (Photo by Vianney Le Caer/Invision/AP)

Cape Town — "Justin Timberlake still mentions Britney after 16 YEARS since their break up! He really cannot have a career without mentioning her literally every single interview (sic)." 

This is just one of the many tweets putting American singer Justin Timberlake on blast about his subtle reference to Britney Spears in his book.

Subtle because Timberlake doesn't actually mention Spears in his new book, "Hindsight: & All the Things I Can't See in Front of Me," but referencing his hit song "Cry Me River" that's allegedly about Spears. 

According to PEOPLE, Timberlake revealed he only needed a couple hours to write one of the biggest — and most personal — songs of his career.

"I've been scorned. I've been pissed off. I wrote "Cry Me a River" in two hours. I didn't plan on writing it," Timberlake writes in his new book.

"The feelings I had were so strong that I had to write it, and I translated my feelings into a form where people could listen and, hopefully, relate to it," Timberlake continued. "People heard me and they understood it because we've all been there."

Timberlake and Spears split in 2002, and fans are unsure why he keeps bringing up their past relationship. Here are some of the fan theories and "tea" shared on Twitter.

Some blamed the media.

While others shared pictures of their Justin and Britney Halloween costumes.