At least 19 people have been confirmed dead after the tragic events, which took place in the foyer at the Manchester Arena, north west England, at the end of the concert, and another 50 people have been injured.
Katy Perry shared with her 98 million Twitter followers: โPraying for everyone at @ArianaGrandeโs show (sic)โ whilst Demi Lovato wrote: โTearing up imagining innocent concert goers losing their lives..praying for everyone and all #arianators โฆ My prayers are with you Manchester.โ
One Direction star Harry Styles wrote on his own Twitter account: โIโm heartbroken over what happened in Manchester tonight. Sending love to everyone involved. โ His bandmate Niall Horan shared: โAbsolutely Horrendous what happened in Manchester tonight. My thoughts are with the great people of Manchester and also Ari and her team xx .โ
Bruno Mars has โno wordsโ after what happened, writing: โNo words can describe how I feel about what happened in Manchester. I donโt wanna believe that the world we live in could be so cruelโ and Taylor Swift offered her โthoughts and prayersโ to all affected.
She shared: โMy thoughts, prayers and tears for all those affected by the Manchester tragedy tonight. Iโm sending all my love.โ
Actor Chris Evans wrote: โWhat happened in Manchester is beyond comprehension. My thoughts and prayers are with everyone impacted by this senseless tragedy,โ whilst model Kendall Jenner added: โwhat happened in Manchester tonight is absolutely horrible. sending my love and prayers to those affected.โ
โGreen Lightโ hitmaker Lorde felt โsickโ after hearing about the tragic events that unfolded.
She wrote to her Twitter followers: โevery musician feels sick & responsible tonight โ shows should be safe for you. truly a worst nightmare. sending love to manchester & ari.โ
British Prime Minister Theresa May has released a statement, paying tribute to the victims of โwhat is being treated by the police as an appalling terrorist attackโ.