Several celebrities weighed in on the spat at the time, including Chloë Moretz, Khloé Kardashian, and Taylor's longtime BFF, Selena Gomez.

Selena's input resulted in her being seriously dragged on social media. She's since deleted these tweets.
Everyone in this industry needs to get their heads out of a hole and look around to realize what's ACTUALLY happening in the REAL world
Well now Justin Bieber has boarded the Shade Train, posting this photo of himself talking to Kanye West over FaceTime, alongside the caption: "Taylor swift what up."
OMG.

TAYLOR. SWIFT. WHAT. UP.
Obviously, this is shady AF because not only is Taylor best friends with Justin's ex, Selena, but it's safe to say that Taylor isn't the biggest fan of Justin – as identified in this GIF.
This was at the Billboard Music Awards in 2013 – the same night that Taylor was asked about Justin winning the Milestone Award and she responded: "Can we have another question?"
Justin is also good friends with Kanye and the whole Kardashian family.

Remember those rumours that he was dating Kourtney?! Remember Kanye going to Justin's concert twice in one week?!
Naturally people have lost their minds over his Instagram post.
I thought the drama ended weeks ago, but hell ya justin😂😂😂😂 #TaylorSwiftWhatUp
Probably everyone's reaction after seeing Justin's post on Instagram #TaylorSwiftWhatUp
I'm ready for new drama #TaylorSwiftWhatUp
When Kim K Notice the post on Instagram from @justinbieber Her reaction be like!! 😜😂📱#TaylorSwiftWhatUp
But someone did make this point.
when taylor shaded justin in 2012/13 she was defending her bf just like justin's doing w/ his friend rn, i'd do the same #TaylorSwiftWhatUp
And of course, people jumped to Taylor's defence, too.
no hate but I feel like I need to answer this for taylor. #TaylorSwiftWhatUp
Justin: less hate more love Justin: Taylor Swift What Up Me: #TaylorSwiftWhatUp