Inside Miley Cyrus' Worst 4/20 Ever

The sick pop singer called it the "wackest ever."

April 21, 2014 — -- Miley Cyrus remains in the hospital for an extreme allergic reaction and the pop singer let her fans know she wasn't too happy about missing the usual April 20 festivities.

"boutta be the wackest 4/20 ever," she tweeted on Saturday.

Cyrus continued on Sunday, "Happy 420/ Easter! I'll be where I've been the passed (sic) week. In bed. Crying. NOT stoned. wackkkkkkkkkkkkkkkkkkkkkkkkkkkkk."

The former tween star, 21, has been hospitalized in Kansas City since Tuesday for a reaction to a prescribed antibiotic, according to her rep.

Read: Miley Cyrus Remains Hospitalized, Two More Shows Canceled

She added Sunday that she was boning up on her literature.

"reading books so i don't die a famous pop pop dumb dumb," she added.

Last week, Cyrus' rep told ABC News, "This type of extreme reaction can last from 5 to 27 days in these types of cases. She will remain hospitalized and is under a d octor’s care until we see some improvement in her condition … Miley is devastated about missing shows and possibly disappointing her fans.”