The Voice's new coach Reba McEntire warns Niall Horan to 'lock up' after she breaks into his dressing room in wild video

THE Voice coach Reba McEntire has decided to have some fun with her co-host Niall Horan behind-the-scenes of the reality singing competition.

Reba showed her fans how to break into and enter their co-worker's private spaces in a video she posted on Instagram.

The 68-year-old country music star was backstage on The Voice set, standing in front of the dressing rooms of her fellow co-stars Kelly Clarkson, 41, and Niall Horan, 29.

She was in full glam, sporting a bedazzled light blue suit with dark-blue studded embroidery and a silk low-cut top.

Talking to the camera, looking TV-ready, Reba revealed that she was trying to "make up" her mind about whether she'd enter Kelly or Niall's dressing room since hers wasn't ready yet.

The former sitcom star decided to go into Niall's because she thought it would be "more fun."

When she went into the already unlocked room, she immediately began eating the One Direction alum's Tostitos chips, which she called Doritos, hoping he didn't mind.

Reba put the chips down upon realizing that Niall's cell phone was on the table near the chips and salsa dip.

She picked it up, inspecting it to see if it was locked with a code.

"I wonder if I could call somebody," Reba said while navigating through his phone.

After figuring out that it was indeed unlocked, she filmed a selfie video of herself on the pop singer's phone, giving him a warning.

"Guess who's in your dressing room? You should learn to lock your phone; bye!" Reba said.

Fans were amused at Reba for going into Niall's dressing room, taking to her comment section to sing her praises for her practical joke.

One fan raved: "I’m hollering. Too funny. I think you and Naill are going to have a blast together."

Another added: "Reba you’re a hoot! I am so excited to watch you on the Voice.

"I will miss Blake but when I found out you were going to be joining the Voice…it made my day!

"And you look fantastic! You have always been my favorite! Love ya…from a fellow Okie."

A third fan cosigned: "He doesn't have a lock on his phone lol.

"I can't wait for Reba !! She's gunna be so good and funny !!"

A fourth noted: "You are awesome Reba, keep them guessing."

Reba joined the cast of The Voice as a full-time judge for Season 24 in place of Blake Shelton, 46, in mid-May.

She previously appeared on The Voice as a mega-mentor.

Reba's joining returning judges John Legend, 44, Niall, and Gwen Stefani, 53, for the season premiere on Monday, May 15, according to Deadline.

This is the first season of the show without Blake, who announced in October 2022 that he would not be returning to his long-standing role.

During the show's first season, Reba served as a Battle Advisor to Team Blake.

Blake finished out his 12-year stint on The Voice with Season 23.

He debuted with the singing competition in 2011 in the show's premiere and was a staple with the program until he announced his departure last fall, saying it was time for him to step away.

"I’ve been wrestling with this for a while, and I’ve decided that it's time for me to step away from The Voice after Season 23," he explained at the time.

"This show has changed my life in every way for the better, and it will always feel like home to me. It's been a hell of a ride over these 12 years of chair turns, and I want to thank everyone at The Voice from NBC, every producer, the writers, musicians, crew and catering people; you are the best."

Meanwhile, Kelly recently returned to The Voice after taking a two-season break.