Amanda Bynes wants to have a "tremendous amount of facial surgery."

The troubled actress -- who recently revealed she was engaged to her 19-year-old boyfriend Caleb -- has taken to Twitter to reveal she is keen to go under the knife to improve her looks because she is on the front page of so many publications.

In a series of tweets, she wrote: "So I'm literally on the cover of every magazine right now.

"F**k I just need a tremendous amount of facial surgery.

"What I need help with is looking pretty.

"Help a n***a out and hop off ma d**k."

Bynes has sparked concerns for her health following a spate of erratic behaviour lately, including being accused of shoplifting on two occasions on Wednesday.

The actress was banned from Barneys New York after walking out without paying for a $200 hat. Earlier in the day, she allegedly tried to walk out of Pookie & Sebastian with a shirt between her arms but she eventually paid for the $128 garment on her credit card.

Bynes claimed the Barneys incident was a misunderstanding because she had been trying to escape people trying to take her picture and had the permission of one security guard to leave the store. But she said there was miscommunication with another member of staff.

The 'Easy A' star recently insisted she hates all men but despite that she is planning to tie the knot to her fiance, Caleb.

She said: "I am very needy for friendship and I hate men. I want to f*** them, but I can now say I'm engaged, I want to be married and I want to be away from people."