Rihanna onstage in New York

See Rihanna's hot Hammerstein Ballroom performance

Jenniffer Lopez slips on stage

Pop diva Jennifer Lopez has bruised her 'sexy back' as she slipped onstage while performing at the American Music Awards.

On the stage which was converted into a boxing ring, the 40-year-old singer and actress was gyrating to her song Louboutins from her new album Love? when the mishap occurred

The Shall We Dance star had climbed onto a human pyramid of male performers. The small accident happened while she tried to jump down, slipping backwards onto her bottom.

But the star saved her face and swiftly leaped to her feet and carried on her performance. The awards night, held at Los Angeles' Nokia Theatre on Sunday, was dominated by spectacular performances by pop music's premiere divas

Madonna on a school in Malawi Photos

US pop star Madonna plants a tree at a ground breaking ceremony for her Raising Malawi Academy for Girls in Malawi. Madonna who is funding the building of the school was the guest of honour at the function. The 51-year-old celebrity arrived in the impoverished southern African country. She was accompanied by her four children _ daughters Lourdes and Mercy, and sons Rocco and David.