She is said to have flown out to the foreign country for privacy during recovery and has had the operation after being tormented throughout her childhood.
A friend of the star told The Sun: "She was still racked with self doubt. She was bullied throughout her school days about the size of her nose and it really affected her badly
"She finally plucked up the courage and flew out to a foreign clinic at the start of last month. She was absolutely terrified before the op and there were points when she thought about pulling out."
Boyfriend Scott Sinclair required medical treatment and this cosmetic surgery is said to have coincided with that.
HAIR: HOW TO AVOID HELEN FLANAGAN'S HAIR EXTENSION FAIL
HELEN FLANAGAN SPILLS OUT OF BUSTY BODICE AT PETA PHOTOCALL
HELEN FLANAGAN WANTS A BABY BY CHRISTMAS