Jessie J has pulled out of a concert after doctors told her she had a fatigue virus.
The star was due to headline the Big Weekend in Pontypridd tonight, but the entire first night of the festival has now been scrapped.
Show bosses explained that she is suffering from cytomegalovirus (CMV), which has apparently caused her "considerable fatigue".
The big-lunged hitmaker explained: "I have been diagnosed with a viral infection recently that has caused me to be extremely fatigued.
"I was hoping to be better but I have been to see my doctor this morning after not feeling great who has advised me I am still in need of rest and to perform will make me worse."
She concluded: "Back to bed I go - so sorry."
The heartbreak of scrapping a performance is certainly not new to the star - last year she had to pull out of a string of shows after damaging her ankle.
Fans will receive full refunds for tonight's tickets.
Jessie J and more storm the Barclaycard Wireless Festival