• Recording artists Blake Shelton (L) and Gwen Stefani perform onstage during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada.

Recording artists Blake Shelton (L) and Gwen Stefani perform onstage during the 2016 Billboard Music Awards at T-Mobile Arena on May 22, 2016 in Las Vegas, Nevada. (Photo : Getty Images/Kevin Winter)

It seems that everything else is going on smoothly for Blake Shelton and girlfriend Gwen Stefani. While it is no news that the couple has been tossed with wedding rumors, latest reports claimed the two may have something else up their sleeves.

It is said that Shelton and Stefani have finally finalized their wedding plans. A source told Celebrity Insider that the country singer and the "Hollaback Girl" hitmaker are planning to make it official at Beverly Hills' Church of the Good Shepherd on May 5, 2017.

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"They can hardly agree on anything," a source added. "Gwen wants to go big on this - and Blake wanted to make it an informal affair down home in Tennessee or their new place in Oklahoma - but he's not willing to go to the mat against her."

The source went on to reveal Stefani's guest list is 400 individuals alone, which includes Jennifer Aniston, Justin Theroux, Katy Perry, Courteney Cox and Johnny McDaid. The two are reportedly considering inviting Stefani's ex-husband, Gavin Rossdale and Shelton's former wife, Miranda Lambert.

The source then claimed that the couple has chosen Jon Bon Jovi's "Blaze of Glory" as their wedding song and perform it at the banquet themselves. Since Stefani wanted an extravagant wedding, she reportedly agreed to pay all the expenses, while Shelton will shoulder their honeymoon.

Stefani and Shelton, who have a combined fortune of $225 million, already signed a prenuptial agreement. The mother-of-three will keep her Beverly Hills' chateau under her name, while the latter's Oklahoma ranch will stay under his. Neither will seek spousal support should the marriage ends.

The wedding news comes after it was reported that Shelton and Stefani are doing all they can to have a child. The latter plans to undergo IVF (In Vitro Fertilization) treatments with hopes of becoming pregnant with a baby girl, an unnamed source told Life & Style Weekly.

"She has incredible doctors and she's explored all her options, including surrogates," the source said. "No matter what, Gwen wants the child to be hers and Blake's baby together. She's ready."

Watch Stefani and Shelton debut as a couple on "The Voice" Season 9 here: