Singer Amy Winehouse leads the way at this year's Music of Black Origin (Mobo) Awards with four nominations.
The 23-year-old, who has just cancelled a string of US gigs because of ill health, is up for best UK female, best R&B act, best video and best song.
Rapper Dizzee Rascal has also been nominated for four awards - best UK male, best hip hop act, best song and best video for Sirens.
The 12th annual Mobo Awards will be held at the O2 arena on 19 September.
Winners will be chosen by the public, with voting taking place on the award show's website.
Winehouse, who has reportedly been in rehab recently, will go up against Beverley Knight, Corinne Bailey Rae, Joss Stone and Jamelia for best UK female.
Speaking of Winehouse's recent health issues, Jamelia said: "I just hope she gets better very soon and can come back and continue to give us the great music she has been doing.
"I think it's fantastic she has been nominated. I think she could have been nominated for a few years now. So yes, it's about time and hopefully she'll perform for us at the Mobos."
The four-time Mobo winner - who will also be presenting the awards ceremony - added she was pleased to have received a nomination herself.
"To be acknowledged for the music that I've made and I've grown up listening to is fantastic. It's always an honour," she said.
"I'm unbelievably excited about hosting. I've hardly done any presenting before, so to be asked to do such a huge thing, yes, slightly nervous."
UK garage performer Kano, who is also up for best hip-hop act, will compete against Lethal Bizzle, Sway and Wiley for best UK male.
Rapper Kanye West takes on 50 Cent in the best hip-hop category.
Winehouse's Rehab is nominated for best song, alongside Dizzee Rascal's Sirens - a re-run of their stand-off at this year's Mercury Music Prize.
Other contenders for the best song award are Ne-Yo, Amerie and Robin Thicke.
Rihanna's hit single Umbrella, which remained at number one in the UK charts for 10 weeks, does not feature in the category.
'Excited and anxious'
The Barbadian pop star, who won best R&B act last year, was not disappointed as she said being picked for best video - for Umbrella - was just as important.
"I put a lot in the song and the video. The video meant a lot to me, being nominated for best video is definitely an honour," she said.
On the night of the awards the star revealed she would be feeling "nervous, excited and anxious".
When asked if she can still stand her all-pervasive song, she said: "I love to perform it, it's one of my favourite songs to perform."
The 19-year-old star admitted she is a big fan of Winehouse's and even bought her album, Back to Black, three times because friends kept stealing it from her.
"I love her so much. If she wins that would be so great," she said.
Rihanna is also the only female in the male-dominated best international act going up against the likes of P Diddy, Akon and TI.
The former Sugababes singer, Mutya Buena, is up for her first Mobo award for best UK newcomer, along with Shola Ama's sister Sadie Ama.
Reggae artist Shaggy, nominated in the best reggae category, will join R&B singer Jamelia in hosting the event.
He promised the ceremony would be "climactic".
He added: "I think it's going to be wonderful. I'm happy to be involved with it."
The event will be broadcast on BBC Three on 19 September, with edited highlights on BBC One two days later.