Blake Shelton surprises his fans with a free show in Las Vegas and has also invited Gwen Stefani and Kelly Clarkson to perform with him.

On Sunday, Shelton shared the news with his fans on social media. He informed them that he will be performing at the Sin City at 10 p.m. on the same night. After singing a series of songs, Shelton's girlfriend, Stefani, had taken the stage at 1:30 a.m and sang her hit songs "Hollaback Girl" and "Hella Good."

Prior to her performance, Shelton asked his girlfriend to join him on stage, but Stefani initially refused. After all, she was just in Las Vegas to show her support to Shelton. After a few minutes of convincing her, Stefani said that she will perform on stage for Shelton's fans if he promises to sing with her and Shelton agreed.

Clarkson also performed at the Planet Hollywood on Sunday. The Voice coach is currently working with Shelton on the hit NBC reality TV competition.

Blake Shelton, Gwen Stefani Talk About Marriage

Other than their recent performance, Shelton and Stefani also made headlines after Cody Alan had asked the country singer if he has plans to marry Stefani. Prior to getting into a relationship with each other, Shelton was married to Miranda Lambert. Stefani, on the other hand, was with her ex-husband Gavin Rossdale.

"I think about it. I don't think it's anytime soon or anything. The more time that goes by, I guess, the closer you'd be getting to that," said Shelton.

During her appearance on The Ellen DeGeneres Show, talk show host Ellen DeGeneres asked Stefani a similar question. She said that her three children love Shelton, but they have not decided on when they will get married. However, the 48-year-old singer said that she thinks about marrying her boyfriend all the time.

How Did Blake Shelton, Gwen Stefani Fall In Love?

Last year, Shelton also denied that his relationship with Stefani started out of the blue. During an interview, the musician said that their friendship had started because they were going through a similar thing at the exact same time.

"It went from that to checking in on each other once a week through email - 'This s*** happened to me, what happened to you?'-to maybe three times a week, then every day, to 'Hey, here's my phone number if you ever want to text.' Next thing I know, I wake up and she's all I care about, and I'm wondering if she feels the same about me," revealed Shelton.

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