Miley Cyrus has postponed more shows due to her mystery illness.

OMG ... frownie face.

Whatever is causing her trouble has forced the singer to push back the weekend's shows in Amsterdam and Antwerp, which have been rescheduled for June 20 and 22.

The official story is that Cyrus was hospitalized April 15 in Kansas City with a "severe allergic reaction" to an antibiotic, which caused her to postpone the rest of her North American tour.

She's now out of the hospital, but apparently not out of the woods.

"After a period of improvement, Cyrus' symptoms have returned and doctors will not permit her to travel," her representative told CNN Wednesday. "This type of extreme reaction can last up to 27 days and Cyrus must remain under doctors' care at this time."

In this Saturday, April 5, 2014 file photo, singer Miley Cyrus performs at the Barclays Center in New York.
In this Saturday, April 5, 2014 file photo, singer Miley Cyrus performs at the Barclays Center in New York. (Photo by Evan Agostini/Invision/AP, file)

Cyrus still hopes to bring her "Bangerz" show to London's O2 Arena on May 6, the rep said.

She became sick in early April with a flu-like illness. She then had a bad reaction to the antibiotic Cephalexin, which left her hospitalized for more than a week.

Contact Tony Hicks at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.