In November 2004, Minogue released her second official greatest hits album entitled Ultimate Kylie. The album yielded two singles: "I Believe in You" and "Giving You Up". "I Believe in You" was later nominated for a Grammy Award in the category of "Best Dance Recording". In March 2005, Minogue commenced her Showgirl: The Greatest Hits Tour. After performing in Europe, she travelled to Melbourne, where she was diagnosed with breast cancer, forcing her to cancel the tour. She resumed the tour in November 2006, under the title Showgirl: The Homecoming Tour. Her dance routines had been reworked to accommodate her medical condition, with slower costume changes and longer breaks introduced between sections of the show to conserve her strength. The media reported that Minogue performed energetically, with the Sydney Morning Herald describing the show as an "extravaganza" and "nothing less than a triumph". She voiced Florence in the animated film The Magic Roundabout, based on the television series of the same name. She finished her voice role back in 2002, before it was released in 2005 in Europe. A year later, she reprised the role and recorded the theme song for the American edition, re-titled as Doogal, which grossed $26,691,243 worldwide.In November 2007, Minogue released her tenth and much-discussed "comeback" album, X. The electro-styled album included contributions from Guy Chambers, Cathy Dennis, Bloodshy & Avant and Calvin Harris. The album received some criticism for the triviality of its subject matter in light of Minogue's experiences with breast cancer. X and the lead single, "2 Hearts" entered at number one on the Australian albums and singles charts respectively. In the United Kingdom, X initially attracted lukewarm sales, although its commercial performance eventually improved. Follow-up singles from the album, "In My Arms" and "Wow", both peaked inside the top ten of the UK Singles Chart. In the US, the album was nominated at the 2009 Grammy Awards for Best Electronic/Dance Album.Minogue began a relationship with French actor Olivier Martinez after meeting him at the 2003 Grammy Awards ceremony. They ended their relationship in February 2007, but remained on friendly terms. Minogue was reported to have been "saddened by false [media] accusations of [Martinez's] disloyalty". She defended Martinez, and acknowledged the support he had given during her treatment for breast cancer. As part of the promotion of her album, Minogue was featured in White Diamond, a documentary filmed during 2006 and 2007 as she resumed her Showgirl: The Homecoming Tour. She also appeared in The Kylie Show, which featured her performances as well as comedy sketches with Mathew Horne, Dannii Minogue, Jason Donovan and Simon Cowell. She co-starred in the 2007 Doctor Who Christmas special episode, "Voyage of the Damned", as Astrid Peth. The episode was watched by 13.31 million viewers, which was the show's highest viewing figure since 1979. In May 2008, Minogue embarked on the European leg of the KylieX2008 tour, her most expensive tour to date with production costs of £10 million. The tour was generally acclaimed and sold well. She was then appointed a Chevalier of the French Ordre des Arts et des Lettres, the junior grade of France's highest cultural honour. In July, she was officially invested by The Prince of Wales as an Officer of the Order of the British Empire. She also won the "Best International Female Solo Artist" award at the 2008 BRIT Awards. In September, she made her Middle East debut as the headline act at the opening of Atlantis, The Palm, an exclusive hotel resort in Dubai, and from November, she continued her KylieX2008 tour, taking the show to cities across South America, Asia and Australia. The tour visited 21 countries, and was considered a success, with ticket sales estimated at $70,000,000. In 2009, Minogue hosted the BRIT Awards with James Corden and Mathew Horne. She then embarked on the For You, for Me tour which was her 

Question: When did Minogue and Oliver broke up?
Answer: February 2007