Troubled singer Amy Winehouse leads the nominations for this year's Mobo Awards.

The 23-year-old star is a contender for best UK female alongside Beverley Knight, Corinne Bailey Rae, Jamelia and Joss Stone.

She has also been nominated for best R&B act, best song for Rehab and best video for Back To Black.

Gallery: 2007 MOBO launch party

But it is doubtful that Winehouse will attend the ceremony next month.

Her nominations were announced on the same day she postponed her US tour, scheduled for September, citing health reasons.

Last week she was admitted to a rehab clinic after being hospitalised for a reported overdose of heroin, Ecstasy, cocaine, ketamine and alcohol.

Her record company say she is suffering from "severe exhaustion".

Winehouse leads the Mobo nominations jointly with Dizzee Rascal, who is also up for four awards.

He is in the running for best UK male, best hip hop act, best song and best video for Sirens.

The 12th annual Mobo Awards take place at London's 02 Arena and will be co-hosted by Jamelia and reggae artist Shaggy.

50 Cent will take on Kanye West for best hip hop act and best UK male.

The rivalry between the pair is so great that "Fiddy" has declared he will quit his solo career if West outsells him when they release their respective albums on the same day next month.

Former Sugababe Mutya Buena picked up her first Mobo nomination, in the best newcomer category.

Full list of nominations

Best UK Female
Amy Winehouse
Beverley Knight
Corinne Bailey Rae
Jamelia
Joss Stone

Best UK Male
Dizzee Rascal
Kano
Lethal Bizzle
Sway
Wiley

Best International Act
Akon
P Diddy
Kanye West
Rihanna
TI

Best Song
Amerie - Take Control
Amy Winehouse - Rehab
Dizzee Rascal - Sirens
Neyo - Because Of You
Robin Thicke - Lost Without You

Best UK Newcomer
Mutya Buena
N Dubz
Sadie Ama
Tinchy Stryder
UnkleJam

Best Video
Amy Winehouse - Back To Black
Dizzee Rascal - Sirens
Kanye West - Stronger
Pussycat Dolls - Wait A Minute
Rihanna - Umbrella

Best Hip Hop
50 Cent
Common
Dizzee Rascal
Kano
Kanye West

Best R&B
Akon
Amy Winehouse
Lemar
Nathan
Ne-Yo

Best Reggae
Collie Buddz
Sean Kingston
Shaggy
Stephen Marley
Tony Matterhorn

Best Gospel
4 Kornerz
BlushUK
G-Force
Jahaziel
Priscilla Jones

Best DJ
George Kay
Jigs
Rampage
Ras Kwame
Ronnie Herel
Semtex
Shortee Blitz
Steve Sutherland
Tim Westwood
Trevor Nelson

Best Jazz
Abram Wilson
Byron Wallen
Dee Dee Bridgewater
Soweto Kinch
Winton Marsalis