Lily Allen's tooth trouble

Lily Allen's in for a painful Thursday.

The singer will undergo surgery to remove not one, not two but all four of her wisdom teeth.

On her Twitter she posted, "Having all 4 wisdoms out on Thurs. OUCH! General anaesthetic, yum."

Lily showed off her engagement ring for the first time last week on her blog. She sadly lost a baby for the second time in December.