Demi Lovato Slays the National Anthem at Mayweather-McGregor Fight

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Demi Lovato came to slay!

The 25-year-old singer rocked the national anthem at the Floyd Mayweather-Conor McGregor fight at the T-Mobile Arena in Las Vegas, Nevada, on Saturday.  

RELATED: Demi Lovato to Sing the National Anthem at Floyd Mayweather-Conor McGregor Fight

Lovato entered the ring in a striking white gown and EFFY jewelry, showing off her fit figure (and plenty of cleavage) as she took the mic to deliver a stunning rendition of the song. 

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The former Disney star was cool, calm and collected during her performance, earning cheers from the audience and praise on social media. 

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ET caught up with the singer earlier this month, when she gushed about her upcoming performance -- and told us that she planned to celebrate her 25th birthday at the fight!

“That's all I've been looking forward to doing… ever since the fight was announced, I was like, I'm going to that fight. It's gonna be amazing and I can't wait to see who wins,” shared Lovato, who turned 25 on Aug. 20. 

“I'll go with friends… yeah, that's what I think about when I think about my 25th birthday. I don't even have a party planned. I'm just thinking about the fight.”

See more in the video below.