British singer Robbie Williams has said he was not engaged to his girlfriend, Ayda Field -- despite proposing to her on a radio show.

The pop star popped the question to Field, 30, live on Australian radio on Friday, only for his London-based spokesman to say it was a joke and deny they were engaged.

Adding to the confusion, Williams' mother Jan told British radio that her 35-year-old son intended to marry Field in the not-too-distant future.

On his website on Saturday, Williams posted a brief blog under the headline Robbie And Ayda: Are They Or Aren't They?

It read: Hey all. We are not engaged. rob x

One of Europe's most successful entertainers, Williams rose to fame as a member of the hit boy band Take That before forging a successful solo career.

The singer, who now lives in Los Angeles, has been out of the public eye since he left a U.S. rehabilitation center in March 2007 where he was treated for prescription drug addiction.

His new album Reality Killed the Video Star is his first release in three years.