11/16/2005 at 04:00 PM EST
There's a new wrinkle in Nicole Kidman's Urban mystery, PEOPLE reports in its latest issue. The actress – who's been spotted with country singer Keith Urban since July but hasn't acknowledged a relationship – was wearing a ring on her wedding finger while walking arm-in-arm with Urban in Boston on Nov. 11.
Has someone popped the question? While Kidman's rep didn't know anything about a proposal, Urban's rep, Paul Freundlich, says, "Right now it's just a rumor. When and if there's a statement we'll make that public."
Still, by the looks of it, the fellow Aussies are in full-on romance mode, sharing cozy meals and trips to the countryside, including a stop near Urban's Nashville home.
Kidman has also been a fixture on Urban's "Keith's Alive in '05" tour. At concerts throughout, "they were inseparable," says a source close to the singer. "It was obvious something is there – a lot more than just a friends situation. You could see something real special was going on between them."
At the Nov. 10 tour stop in Albany, a concertgoer observed that Kidman was "very attentive and didn't look away from the stage." Meanwhile, Kidman has returned to the D.C. set of her sci-fi thriller The Visiting, while Urban has continued his tour – and he was named CMA's entertainer of the year Tuesday night in New York.
If the two decide to make it official, there won't be any shortage of well-wishers. "They speak the same language," country singer Trace Adkins tells PEOPLE. Says a source who knows both: "They're very, very happy."