Mariah Carey Lip-Sync on 'American Idol' Finale? MiMi Stirs Twitter Uproar with Performance Scandal before Candice Glover, Angie Miller 'AI' Face-off [WATCH]

On the "American Idol" season 12 finale, judge Mariah Carey performed an amazing rendition of six hit songs ("Vision of Love," "Make It Happen," "My All," "Hero," "We Belong Together," and her new single "#Beautiful"). But did MiMi actually lip-sync... on a show where she critiques contestants on their LIVE singing talents? Several fans believe Carey crooned along to a pre-recorded track during the finale, and many "haters" recently hit up Twitter to express their disappointments. Do Mstars readers really think the pop diva lip-synced during the "live" performance?

Check out Carey's "AI" performance here:

And although the crowd seemed to love it, some at-home viewers were not impressed:

@entylawyer: "Mariah Carey lip synched on a show where she judged people who are not allowed to lip synch. So disappointing."

@rcatlin: "After her finale performance on "Idol," wondering why as judge Mariah Carey hadn't advised contestants prerecord songs and just lip synch."

@RobertJP90: "There are two types of artists Vocalists & performers. If you're a vocalist,you should NOT lip-sync. Especially on the caliber of Mariah."

@ArtistryMDBeats: "Mariah Carey needs to practice her lip syncing. She on American Idol right now making a fool of herself."

@FreakoSuave813: "Can we please discuss @MariahCarey's stellar lip syncing last night on #americanidol."

@neen118: "Mariah Carey lip syncing on a live show really though?!? When a child can tell, that's BAD!! Can we get Originality please! It's becoming..."

@PSYCHICTWINS: "Watching Mariah Carey lip-syncing on American Idol reminds me of watching Godzilla attack Tokyo but with more chandeliers."

Following the lip-syncing "scandal," Carey's reps heatedly denied the rumors with Entertainment Tonight:

"ET can set the record straight as Mariah's reps tell us she absolutely sang the entire medley... completely live! Not only that, but we hear she delighted the crowd in between live shots by singing additional hits."

So what do Mstars fans believe?

FYI: Candice Grover won the singing competition over fellow "AI" finalist Angie Miller, read more on that here.