[embed]https://www.instagram.com/p/Bk50iZ2H3U7/?tagged=mariahcarey[/embed]

Mariah Carey premiered her new residency in Las Vegas last night, but she seems to be up to her old tricks during her big debut! Cameras caught the diva lip syncing yet again.

Carey, 48, kicked off her latest residency, “The Butterfly Returns,” at The Colosseum at Caesars Palace on Thursday, July 5.

While belting out her classic hit “Boyfriend,” Carey was placed on a rolling box by dancer and boyfriend Bryan Tanaka. But the songstress slipped and fell off the box as it tipped over.

disastrous New Year’s Eve performance at the start of 2017.

claimed she was sabotaged by Dick Clark Productions, and made to look bad on purpose to boost the show’s ratings.

She was also busted faking it during a 2015 show in Jamaica and at the BET Awards in 2013.

Watch the video above!

We pay for juicy info! Do you have a story for RadarOnline.com? Email us at [email protected], or call us at (866) ON-RADAR (667-2327) any time, day or night.