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(USA TODAY) Nope, that oxygen mask isn't part of an elaborate Lady Gaga costume. It's the real deal.

The singer was hospitalized in the Mile-High City of Denver for altitude sickness after her concert Wednesday night, and she posted this up-close-and-personal selfie.

"Altitude Sickness is no Joke! #hitThatHospital(expletive) #artRaveDenver many true ravers crowd tonight," she captioned the photo on Instagram.

We're getting flashbacks to Miley Cyrus' hospital selfies in April when she had to cancel a large portion of her Bangerz tour, thanks to a severe allergic reaction.

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