Ex-Hear'Say singer Kym Marsh was taken to hospital after being accidentally elbowed in the face by a dancer in her stage musical Saturday Night Fever.
She was knocked to the ground backstage before she was due to perform at London's Apollo Theatre on Thursday.
The 28-year-old's lead role, Annette, was played by an understudy.
Marsh's nose was not broken and she is due to return to the musical on Saturday. "She was taken to hospital as a precaution," her spokeswoman said.
Cherie TV talk beaten in ratings
Cherie Blair's first television interview failed to top the ratings on Thursday, beaten by Ready Steady Cook, The Weakest Link and Neighbours.
Channel 4's Richard and Judy show had an average of 1.8 million viewers on Thursday, when the prime minister's wife discussed her new autobiography.
BBC Two shows Ready Steady Cook and The Weakest Link attracted averages of 1.9 and 2.8 million viewers respectively.
A 1730 BST repeat of Neighbours drew a BBC One audience of 3.2 million.
Jazz star Dolly Rathebe, 74, dies
South African jazz star Dolly Rathebe has died following a stroke at the age of 74.
Rathebe found fame in 1949 when she sang in the film Jim Comes to Joburg, going on to perform with Johannesburg's top bands during the 1950s.
She abandoned her career at the height of her popularity after being stabbed by a jealous fan.
But Rathebe returned to perform with the Elite Swingsters in 1989, recording an album two years later.
Star award for actor Jim Carrey
Jim Carrey is to receive the American Film Institute's Star Award at the 2005 US Comedy Arts Festival.
The actor, winner of Golden Globes for The Truman Show in 1999 and Man in the Moon in 2000, will be honoured in a career tribute in Aspen, in February.
Previous Star Award winners include Billy Crystal, Rob Reiner, Steve Martin, Mike Myers and Diane Keaton.
Jean Picker Firstenberg, of the American Film Institute, said Carrey was the "rarest kind of actor".