Rumors increased about the star's rapid weight loss last year when she posted pictures of herself on Instagram that displayed her slimmed down figure.
The 27-year-old star confirmed to People at the beginning of January that she would be "unavailable for the next 30 days, seeking treatment for my eating disorder... to learn to love myself again. Exactly as I am." She admitted to the magazine that, "I am a crusader for being yourself and loving yourself but I've found it hard to practice."
The singer seemed in good spirits and health on Thursday when she posted a photo of herself on an airplane on Twitter and tweeted "Happy to be back! Feeling healthy & working on tons of new music. I can't thank my fans enough for all the love & support u have given me."
She was later seen deplaning at LAX wearing a sweatshirt emblazoned with the phrase "IMA SURVIVOR."
Swim Week Miami Beach 2014 [PHOTOS]