Celebrities who have battled breast cancer

1 of 15: Anastacia, known for pop hits such as 'I'm Outta Love' and 'Left Outside Alone,' revealed on Fev. 27, 2013 that she has been diagnosed with breast cancer for the second time in 10 years. As a result, she canceled an upcoming European tour.

The blonde, bespectacled singer, whose full name is Anastacia Lyn Newkirk, was scheduled to begin performing concerts in Europe on April 6, in London, to promote her 2012 album It's A Man's World.'

'I feel so awful to be letting down all my amazing fans who were looking forward to 'It's A Man's World Tour," she said in a statement on her website. 'It just breaks my heart to disappoint them.'

The statement added that Anastacia will continue working on her sixth studio album, which was originally planned to be released later in 2013, and hopes to schedule a new tour.

(Pictured: Anastacia appears in the 2012 music video 'Best of You.' / Anastacia appears in the 2004 music video 'Left Outside Alone.') (BMG / Sony Music Entertainment Inc.)