Busta Rhymes has been stopped from entering the UK for tomorrows Orange Rock Corps event.
The rapper is currently being held by immigration officials at London City Airport because of unresolved convictions in the US.
He has previously been charged with assault and possessing weapons.
Reports say Busta- real name Trevor Smith- was nearly deported to Amsterdam until his legal team intervened.
They have now secured a legal injunction preventing his deportation and currently face a battle to get Rhymes into the UK.
Busta is in London for the Orange Rock Corps event which rewards young people who volunteer for four hours with a ticket to the gig.
John Legend and Guillemots are also playing the event- which takes place at the Royal Albert Hall tomorrow (Friday September 26).
Organisers have said that Ludacris will replace Busta Rhymes if he is not granted entry to the UK.