Miley Cyrus
 is having a rough day. 

The "Can't Stop" singer was hospitalized for a severe allergic reaction to antibiotics. The pop star's scheduled show at the Sprint Center in Kansas City tonight has been canceled.

The 21-year-old tweeted a photo from her hospital bed, giving fans her most sincere apologies.

"Kansas I promise Im as [heartbroken] as you are. I wanted so badly 2 b there 2night. Not being with yall makes me feel shittier than I already do," she posted on Tuesday. 

"Mr. Octopussy & some amazing Drs are taking good care of me," she added. 

Miley has been placed on medical rest by her doctors and it is unclear when the blonde beauty will be back on her feet. 

We hope Miley gets better soon! Click "Launch Gallery" above to see even more of her best TwitPics!

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