Tinie Tempah has pulled out of his performance at the Mobo Awards because of "music industry politics".
The British rapper posted a handwritten note on Instagram to say his withdrawal from the show was beyond his control.
The message said: "I will not be performing at this years Mobos for reasons that are outside of mine and the Mobos' control.
"The Mobos is a ceremony I have grown up watching and take pride in. "It's given a platform to so many artists who have inspired me. So I always go above and beyond to attend. I am gutted to not be performing.
"I didn't go into this much detail because I want to have a moan. I wrote this because my music and my culture is very important to me and this has been the same issue year after year.
"It is frustrating when music industry politics dictate my ability to celebrate either.
"It's been a great year for British music, especially the underground. I will be watching and supporting. TT."
The awards ceremony Twitter account shared the post with the caption: "Message from @TinieTempah regarding his performance tonight. (sad emoji) We appreciate the kind words and we will always support."
Earlier Professor Green was announced as a late addition to the line-up.
Beyonce, Drake and Justin Bieber are all in the running to win at the 21st anniversary edition of the awards.
Performers at this year's event include Craig David, Laura Mvula, Clean Bandit and Chase & Status.
Grime music star Kano and soul singer Mvula are leading the pack for nominations with four nods each.
Fresh from his Mercury Prize win, Skepta has picked up nominations for best male, best grime act and best album for Konnichiwa.
The Mobo (Music of Black Origin) Awards celebrate and honour stars of any ethnicity who create and perform black music.
Hosted by Melvin Odoom and his Kiss Breakfast Show co-host Rickie Haywood Williams, the ceremony will take place in Glasgow's SSE Hydro in what will be the event's fourth time in the city.
This year's Paving The Way award will be given to songwriter and producer Ms Dynamite and Olympic champion boxer Nicola Adams.
The award is designed to celebrate individuals in any field "punching above their weight" and who are creating a path for others to follow.
- The Mobo Awards 2016 will be aired live on ITV2 from 8pm