Just weeks after dumping backup dancer Bryan Tanaka over his gold-digging tendencies, Mariah Carey is not only back with the 34-year-old, but has been partying non-stop since their reconciliation.

"Her friends fear she is out of control and having a crisis," an insider tells Life & Style. "She's lashing out at loved ones, drinking, and looking for love with the wrong men!"

MORE: See Mariah Carey and Nick Cannon's Relationship Timeline From the Beginning

What makes matters worse is that when the 48-year-old is tipsy, "her inner diva comes out more than usual," the insider explains. "[She] will stand in front of the mirror having assistants rearrange lighting until she's happy with what she sees."

mariah carey bryan tanaka splash

Mariah and Bryan on June 3.

And those closest to her are concerned that she'll make a stupid mistake with Bryan on top of everything else. "Her friends are worried she could end up in a messy divorce," the insider adds.

Nick Cannon previously admitted that his ex-wife can be a bit of a drama queen, revealing on The Wendy Williams Show that the singer "shut the whole hospital down" in 2011 when she gave birth to the couple's twins, Moroccan and Monroe.

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But ultimately, Nick has nothing but nice things to say about Mariah and the way they've co-parented since their split in 2014. "You put the kids first, but then when you understand that you have unconditional love for these human beings and you want the best existence for them, then you put whatever differences you may have had aside," he explained.

"A lot of times when you think about breakups in relationships, it's usually over ego. And if you can remove your ego from that, and make it about your loved ones, then that's what it's about."

For more details on Mariah’s out-of-control behavior, pick up the latest issues of Life & Style, on newsstands now. And scroll through the gallery below to see her transformation over the years!