UPDATE: A rep for Cyrus tells E! News the singer is "devastated" she's now had to cancel three shows on her "Bangerz" tour, and unfortunately she may not be back on the road as soon as she would like.
"Miley was suffering from a sinus infection during her tour in N.C. a week ago. She was prescribed the antibiotic cephalexin which she has now suffered an extreme allergic reaction to," the singer's rep told the website. "This type of extreme reaction can last from 5 to 27 days in these types of cases."
The rep went on to say that Cyrus will remain in hospital until doctors see an improvement in her condition. "Miley is devastated about missing shows and possibly disappointing her fans," her rep said.
PREVIOUSLY: Miley Cyrus was rushed to the hospital on April 15 after suffering a "severe allergic reaction to antibiotics," her rep told Gossip Cop.
The 21-year-old "We Can't Stop" singer was scheduled to perform tonight at the Sprint Center in Kansas City, but she has been placed on "medical rest" by doctors and will be unable to perform tonight, according to a statement posted on the venue's website.
Cyrus appears to be recovering nicely, as she already alerted her fans as to how upset she is for having to cancel the show:
The former Disney star also comiserated with a fan, writing , "trust me. I hate this. & I hate hospitals. & I hate needles. & I hate laying in a bed bored AF. & I hate feeling." Meanwhile, it appears that Cyrus is in good company as she recovers from her allergic reaction: