Nicole Kidman has refused to comment on new rumours that she’s pregnant with husband Keith Urban’s baby.

Reports in the US have claimed that Nicole has undergone fertility treatment and discovered she was pregnant last week after using a home pregnancy test.

According to a source, Keith, who is currently in rehab to work through alcohol problems, “was happy, but uneasy, about the news… He knows how desperate Nicole has been to have a baby, but the timing couldn’t be worse for him.”

Despite previous rumours that he was in a Nashville clinic, Keith and Nicole were been spotted together near the Betty Ford Center in California at the weekend and a source close to the couple told Us Weekly that he is expected to stay at the famous clinic for 35 to 40 days.

Keith was awarded the Best Male Vocalist trophy at the Country Music Association Awards in Nashville on Monday night. In his absence, his acceptance speech was read out by Ronnie Dunn, of country duo Brooks & Dunn and the message expressly thanked Nicole for standing by him during his problems.

The Us Weekly source added that the two are just “look[ing] forward to resuming their life together.”