KEITH Urban has set tongues wagging after he changed the lyrics of a song written about his romance with ex Nicole Kidman to include his new female guitarist.

Yesterday, actress Nicole, 58, filed for divorce from country music star Keith, 57, formally ending their 19 year marriage .

The shock filing came just 24 hours after their split rocked the celebrity world.

While the news came as a bolt out of the blue for fans, the couple quietly separated in June and insiders in Nicole's camp believe Keith has already moved on with someone else.

The speculation around the split ramped up overnight as a clip of Keith performing The Fighter at a recent show gained traction with the spotlight on the former couple.

The footage, which was shared by his guitarist Maggie Baugh, 25, on

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