Nicole Kidman made sure that her husband, Keith Urban, has the best birthday ever. The actress, recently, shared on social media a sweet birthday tribute to Urban amidst the persistent rumors about their marriage. The latest of which is the one romantically linking Kidman to her Big Little Lies co-star Alexander Skarsgård. 

Just recently, Kidman shared a sweet message on Keith's birthday. In return, the country singer also took to Instagram to express his love and gratitude to his wife. He shared a photo of Kidman hiding behind a large bouquet of red roses along with the gifts that he received from her. The couple celebrated the singer's 52nd birthday amidst the persistent speculations about their marriage.

Rumors have it that the Graffiti U hitmaker is furious after hearing the news that his wife is reuniting with Skarsgård in a new movie called The Northman. The movie is, reportedly, is set to film in Iceland and this makes Urban really mad.

Woman's Day (via Gossip Cop) cited an insider that claimed Urban feels threatened by the connection that his wife and Nicole and Skarsgård's development in their TV series. Now that they are about to star together again in a new movie, it's a huge blow to The Ranch frontman.

"The reality of them spending all this time together so far away will have him feeling very vulnerable," the source said. 

The insider claimed Urban's insecurity over The Legend of Tarzan actor started two years ago. It was during the Emmy Awards when Kidman gave Skarsgård a congratulatory kiss after winning the Best Supporting Actor in a Limited TV Series award for his portrayal as Perry Wright, Kidman's character husband in Big Little Lies. 

The source of Woman's Day said Urban was deeply humiliated at the time but moved past it on the basis that it happened once and will never again. The insider also alleged that the "Blue Ain't Your Color" hitmaker believed Kidman when she promised that her on-screen husband is just a friend. However, the country singer's mood reportedly changed when the news about the reunion film came out. 

According to Variety, The Northman is a Viking revenge saga that is set in Iceland at the turn of the 10th century. The movie will be helmed by The Lighthouse director Robert Eggers.

Gossip Cop debunked the rumors, saying Kidman's spokesperson assured the couple's fans that there is nothing true about it. Kidman's rep stressed that Urban is not suspicious about the Moulin Rouge actress and Skarsgård's working relationship nor he is furious about the actress doing another project with the actor. In fact, the couple attended the Giorgio Armani fashion show in July along Skarsgård.