In March 2007, the Sugababes collaborated with fellow British girl group Girls Aloud for their eighteenth single, a cover of the song "Walk This Way" by Aerosmith. The track was released as the official single for Comic Relief. "Walk This Way" became the group's fifth UK number one single.  Following their Greatest Hits Tour, the Sugababes returned to the recording studio in mid-2007 to work on Change, their fifth studio album, and the first to feature Berrabah on all tracks. "About You Now" was released as the album's lead single in September 2007. Upon release, the song became the group's sixth UK number one hit and first Hungarian chart-topper. It remained atop the UK Singles Chart for four weeks. "About You Now" was nominated for a 2008 BRIT Award for Best British Single and is to date their highest-selling single, with sales standing at almost 500,000 copies. In the 2009 edition of the Guinness Book of World Records, "About You Now" was listed as the "first track by a British pop act to top the singles chart solely on downloads". The song was also named as the "biggest chart mover to the number one position in the UK".  In October 2007, Change became the group's second UK number 1 album. For the second time, the group topped the singles, album and download charts simultaneously. The album's title track "Change", was released as the second single in December 2007 and peaked at number 13 in the UK. The album sold 494,000 copies in the UK, and was certified platinum. The third and final single from Change was "Denial", which reached number 15. From March to May 2008, the Sugababes travelled the UK on the thirty-date Change Tour, their biggest tour to date.  Following the Change Tour, Sugababes returned to the studio to write and record tracks for their sixth studio album, Catfights and Spotlights. It was reported that producer Timbaland had approached the Sugababes to work on their sixth album, but due to time restrictions, a collaboration did not occur. "Girls", the lead single from Catfights and Spotlights was released in October 2008. The single peaked at number 3 in the UK, making it their first lead single since One Touch not to reach number 1. The album peaked at number 8 in the UK Albums Chart. Its second and final single, "No Can Do", was released in December and peaked at number 23 in the UK. In January 2009, the Performing Right Society named Sugababes the fourth hardest-working band of 2008 due to the number of concerts they had performed during that year.

Answer this question "did they perform with anyone?" by extracting the answer from the text above.
due to time restrictions, a collaboration did not occur.