Amid rumors that “Voice” coach Blake Shelton desperately needs rehab, the “Sangria” singer made an exciting announcement: He’s hosting a free concert in Nashville. The country star took to Twitter last week to share the news.

First, he teased 13.6 million followers. “I’ve got a secret ... who wants to hear it?!?!?!” he wrote Friday. After more than 2,300 fans showed interest, he teased another bit of information: “My managers and label are #gonna kill me for telling y’all ... but who gives a s---!”

Finally, the Grammy-nominated singer shared the good news. “I’m playing a FREE outdoor concert, next Wednesday Sept. 23 at 5:30 PM out in front of my label, Warner Music Nashville. #PickinOnThePatio,” he wrote. More than 4,200 of his fans liked the comment.

Tickets are not needed for the show. For past free shows, however, tickets were required.

Warner Music Nashville, which is located 20 Music Square E., confirmed the open show. But WMN offered a slight venue change. The label said the patio wouldn’t have enough room to contain all the people, and suggested that fans stand along 16th Avenue.

When Shelton tweeted, “Y’all better start building a stage and figuring this s--- out, because I’m doing it!” WMN offered their suggestion.

The concert will take place two days after NBC’s “The Voice” returns. Shelton, 38, told the crowd at the iHeart music festival in Las Vegas Sunday that the past year has been “weird”; he and Miranda Lambert divorced in July. But he had something positive to add. "... At least I got my songs coming out,” the star told the crowd.

Shelton is slated to release a greatest hits collection titled "Reloaded: 20 #1 Hits” on Oct. 23. The album will contain his first No. 1 hit, “Austin,” and other favorites like “My Eyes” and “Lonely Tonight.”

Follow me on Twitter @mariamzzarella