source BBC News:
The pair, who met when Piper appeared on Evans' TV show TFI Friday, married in Las Vegas five months later in 2001. They separated in October 2004.
Evans, who is 17 years Piper's senior, famously wooed the teenage pop star with a Ferrari filled with roses, even though she could not drive at the time.
Piper, 25, has insisted she will not seek any money from her ex-husband.
Last year Piper revealed how she regretted not telling her parents in person about the wedding in Las Vegas, which reportedly cost £250 and was attended by six friends.
Following the ceremony, the couple travelled for 18 months before returning to the UK where Piper kicked off her acting career with a role in BBC's The Canterbury Tales.
She went on take a leading role in the return of Doctor Who, as the Doctor's assistant Rose Tyler.
Piper was the youngest female solo artist to reach number one with her debut single, Because We Want to, in 1998.
Evans has recently resurrected his radio career by winning two Sony awards for his BBC Radio 2 show.