Music
Rex Features
The 20-year-old had begun final song 'Umbrella' after being carried around the Acer Arena on a harness.
Rumoured boyfriend Chris Brown joined her for the duet, but Rihanna hunched over and signalled that she was not well.
She left the stage clutching her stomach, while Brown finished the song alone. No explanation for the incident has yet been given.
Singles Reviews
DJ Fresh ft. Rita Ora: 'Hot Right Now' reviewThe DJ's latest effort lacks the magic of its predecessor.
The Sound
Playlist: 10 tracks you need to hearIncluding Katy Perry, Will Young and Nicki Minaj.
Music Interviews
Cher Lloyd: 'LA Reid loves scrambled eggs'Digital Spy finds out what the singer has been up to in America.
Album Reviews
The Ting Tings: 'Sounds From Nowheresville' reviewThe duo overcomplicate matters on their second studio album.
