*Mariah Carey moved swiftly to replace her PR vacancy after being abruptly dumped by her longtime publicist Cindi Berger earlier this week.

According to Page Six, she’s assembling a whole new management team ahead of what she hopes will be a career comeback in Las Vegas.

Leading the team is Chris Chambers of the PR company Chamber Group, whose clients have included Drake, Lil Wayne and Quvenzhané Wallis.

Carey has also hired TV producers/managers Stella Bulochnikov and Brian Sher to represent her after severing ties in August with her former manager Jermaine Dupri.

“Mariah is creating a whole new team around her,” an insider said. “New life, new relationships, new label, new management, new publicist, new residency, new, well, everything.”

The departure of Berger after more than 15 years comes just weeks before the May 6 launch of Carey’s residency at Caesars Palace Las Vegas, where she’ll sing 18 of her No. 1 hits. An album of the chart-toppers will be released later this summer.

It was Berger who was guiding Carey through her messy divorce from Nick Cannon as well as her holiday meltdown at Rock Center, during which she kept fans waiting in the cold for hours, then never showed to a taping of NBC’s “Christmas in Rockefeller Center” holiday special. She instead performed live a day later — and poorly at that.

Despite the drama, sources said Carey’s “more focused” as she starts rehearsals for Vegas next week. “Mariah’s done a lot of soul-searching . . . and when she went into the studio to start work on her new album, she felt more happy and free than she ever had and realized she wanted a fresh start.”

As previously reported, she’s also reportedly working on a Christmas movie with her homie Brett Ratner.