LADY Gaga will go to any heights when it comes to pleasing her Little Monsters.
But the sky was apparently the limit when the kooky singer was struck down with altitude sickness after performing in Denver for her artRAVE: The Artpop Ball Tour last night.
The 28-year-old fashionista shocked fans when she shared a worrying selfie of her in a hospital bed on Instagram.
Gaga is seen to have her impressive fake eyelashes in tact behind an oxygen mask.
"Altitude Sickness is no Joke!" she captioned the photo.
"#hitThatHospitalS**t #artRaveDenver many true ravers crowd tonight."
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