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Bieber wades in to Kayne & Taylor feud

Justin Bieber's the latest celebrity to wade in to Kanye West's feud with Taylor Swift.

It's after he posted a screenshot of his FaceTime phonecall with Kanye to Instagram, captioning the photo with the words: Taylor Swift what up. 

The photo, which also features their manager, Scooter Braun.

Fans were quick to see Justin's post as a dig at Taylor, which led to the hashtag #TaylorSwiftWhatUp trending worldwide on Twitter. 

It all started with Kanye West's controversial lyrics about Taylor Swift in his song Famous.

This is how Taylor respond a few weeks back on her instagram:

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