It is official that celebrity couple and country music powerhouse - Blake Shelton and Miranda Lambert – have decided split after four years of marriage, and one thing everyone will want to know is the reason for their divorce. Well, it is reported that "infidelity" has ripped their relationship apart, which eventually ended up in painful separation.

Blake Shelton, 39, and wife Miranda Lambert, 31, announced their separation Monday, terming it as amicable.

According to an exclusive report by TMZ, Blake Shelton filed for divorce from his wife of four years, Miranda Lambert after suspecting her of cheating on him for months. Sources told the website that the country singer thought reports of his wife hooking up with country singer Chris Young was believable. As if that's not enough, he learned that Miranda was cheating on him with another person, "who is not a country singer." 

It is also reported that the couple had disagreement over starting a family.

The same website had reported Monday that the couple had filed for divorce a while ago and that that it would be finalised soon with financial arrangements being already worked out.

"This is not the future we envisioned and it is with heavy hearts that we move forward separately. We are real people, with real lives, with real family, friends and colleagues. Therefore, we kindly ask for privacy and compassion concerning this very personal matter," read the couple's statement obtained by the website

It may be mentioned that the celebrity couple has been dogged by controversies since they tied the knot in 2011. They shared great chemistry while performing "You're the Reason God Made Oklahoma" together at the CMT 100 Greatest Duets concert in 2005, and Shelton was still married to Kaynette Williams then. Their relationship blossomed after the country singer got divorced from his first wife.

It may be recalled that Blake Shelton was rumored to be cozying up with singer Cady Groves, which he had denied. Then reports of Miranda having an affair with country singer Chris Young surfaced. The couple has been putting up a brave face, telling the world that they are happy by appearing in public together but reality seems to have struck finally as they have announced separation.