Sinad O'Connor has received her marriage licence.

The 45-year-old Irish singer applied for and received the legally binding document honouring her union with soon-to-be husband Barry Herridge on Wednesday night.

The pair have flown into Las Vegas to conduct a drive-thru wedding on Thursday.

Sinad is elated about today's ceremony.

"I've been married before, but I've never had my dream wedding in Vegas," Sinad told the Irish Independent newspaper.

"I wanted to do it there because it's casual, quick, not religious and, most of all, very romantic. We wanted a proper rock n' roll wedding."

Sinad and Barry met through the Internet as a result of a campaign to meet potential suitors that the Nothing Compares 2 U singer held in August.

She wrote about how determined she was to find a man on her blog. Sinad's post caused controversy, as she admitted she was "desperate for sexI am in the peak of my sexual prime and way too lovely to be living like a nun, and it's very depressing."

Barry contacted Sinad shortly after reading her blog via email and the pair quickly fell in love.

This will be Sinad's fourth wedding, with her divorce from her third husband Steve Cooney finalised in April of this year.

The star has also been married to John Reynolds and Nicholas Sommerlad and has four children.