Where sickness is concerned, Mariah Carey has learned to shake it off — she's back in the holiday spirit and back at work.

Mimi, who was forced to cancel and postpone dates across her much-anticipated Christmas tour after falling ill, gave fans reason to be merry last night (November 30) when she posted an Instagram photo in which she said she was officially off the DL.

"Feeling better and back at work! Looking forward to seeing you today at the World AIDS Day 2017 concert and then starting the Christmas tour festivities!" she wrote to resounding cheer from fans.

"Can't wait you to spread Christmas joy!" one wrote, while another noted "CHRISTMAS HAS OFFICIALLY BEGUUUUNNNN."

Less than a week ago, Carey posted an Instagram update alerting fans to her shows' postponements, noting:

“I hope everyone had a wonderful Thanksgiving with loved ones; it’s certainly nice to remember what we are grateful for!...Like most, I’m thankful for my overall health…for which I need a bit more time to get right. Doctors have ordered a few extra days of rest before I can finally fly to New York and take the stage for my Christmas Tour.”

Mariah Carey Through the Years: