Bieber, 25, joined Ariana, also 25, during her second weekend of headlining Coachella, with the pair performing a duet of Justins tune Sorry.
However, the popstar was caught out lip-syncing, with the backing track beginning seconds before Justin lifted his mic to his lips.
E! Nightly Pop host Morgan Stewart noticed the error, and said on her show: I did not realise it was going to be that bad.
She then joked about Justins acne, saying: He definitely looks like he put an Oxy pad on that forehead, but I dont care. That is f***ed up! As the audience cringed, she added: We all have forehead acne, its normal.
And Justin wasnt having it.
The Baby singer tweeted: @Morgan_Stewart imagine if you spent even half the time you spend laughing at other peoples expense actually building people up and encouraging people how much positivity you could bring. What hurts about this is the fact that you have a platform to make a difference
And rather than being positive you belittle people. Think about how awesome it felt for me to be on that stage after being away for so long the excitement and joy it gave me doing the thing i love the most, i sang to to backtrack like most cameos do this is a normal thing, and rather than try and make people feel accepted and loved you find things to pick apart like the world isnt full of that already.. we can find something negative to say about anything or anyone.
He continued: When are we gonna be the kind of people that find joy in adding value to one another and not tearing each other apart..
Ariana had her friends back, and in a series of now-deleted tweets, she defended Justin as well as seemingly lashing out at all bloggers.
The Thank U, Next songstress tweeted: we also decided to do this ten minutes before my set started. we had 0 soundcheck, 0 rehearsal. u were singing with the back tracking like most cameos do. people are bored. people dont know how it feels to be under such scrutiny. the world was happy to have u on stage again.
People are so lost. One day everybody that works at all them blogs will realize how unfulfilled they are and purposeless what theyre doing is and hopefully shift their focus elsewhere. Thats gonna be a beautiful ass day for them! I cant wait for them to feel lit inside.
More: Justin Bieber
She also called Morgan ugly in a reply to a fan, writing: people look so ugly when they talk about other people like this, its crazy. like no matter how pretty you are or how long u spent getting ready, u ugly to me now. HOW do people watch s*** like this lmao.
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