It's safe to say Mariah Carey didn't have one of her best performances at the Jamaica Jazz and Blues Festival Friday night.

The 44-year-old diva had more than a little trouble lip-synching to a few of her biggest hits like "Fantasy" and "Always Be My Baby," and it was all caught on tape. As the audio plays, Mariah clearly misses her cues, making the fact that she isn't singing live that much more obvious.

This isn't the first time Mariah's singing has been scrutinized. She kicked off her Elusive Chanteuse Show tour in Japan in October, but it wasn't quite the start she was hoping for. Amid a few technical difficulties with her microphone, her trademark powerhouse voice also seemed to fail her.

Mariah's most recent performance doesn't bode well for her highly-anticipated Las Vegas residency at Caesar's Palace, which is set to begin in May. Last month, Carey confirmed the big news on "The Ellen DeGeneres Show," when she assured her fans that she'll be singing her greatest hits such as "Visions of Love," "Emotions" and "One Sweet Day."

"This is a special event for me," she said. "And again, I have to hope that the fans will enjoy this cause I’m gonna be performing, which was kind of inspired by my album #1's, and this is now the updated version with 18 of them."

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