Katy Perry’s battling the flu and urging fans to pray that she is be back in shape in time for the start of her European tour, which begins on Sunday.

On Wednesday, the “I Kissed A Girl” hitmaker was forced to leave the 2009 Brit Awards early after vomitting backstage.

In an entry on her website Thursday, Katy admits her London hotel room “smells like death,” adding that she’s really feeling the pain/

“I can’t tell you how bad I feel right now. Last night I was sweatin’ it out… I have the doctor on speed dial if the fever gets over 101/102…..I thought I was invincible and then my body decides to show me otherwise. I’m stuck in bed for the next couple of days as I should be… I’m gonna go back to sweatsville and try and sleep it off some more… I gotta get better; I’m starting (a) tour on Sunday here (in London)… so say a little prayer if you think of it.”

Get better soon, Katy!