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Taylor Swift probably wants to know why Justin Bieber has gotta be so mean. Then again, she might soon be mean right back.

Tay is no stranger to writing songs that are about her real life, so Justin may want to brace himself. His newest tune, "All Bad," is a diss track that's reportedly directed at T-Swift, who is close pals with Selena Gomez and is rumored to have discouraged Selena from dating the Biebs.

But word has it that Taylor is apparently now planning her revenge. Uh-oh.

"[Taylor] has heard the song, and she is definitely going to respond at some point," a source tells Hollywood Life. "She has the mentality now that payback is a bitch. A song about him has no timetable, but it’s inevitable."

This news perhaps shouldn't come as a huge surprise. After, T-Swift has previously released a song called "Dear John," which is a scathing song that's widely regarded to be aimed at ex-boyfriend John Mayer. And "I Knew You Were Trouble" is said to be her way of bashing Harry Styles.

So do you think Taylor should take the high road and ignore Bieber's song? Or are you excited to have to her slam Bieber in song form?

Source: Hollywood Life