Charlie is currently in on the White Isle celebrating Joey Essex's 23rd birthday and was seen cosying up to the unnamed woman at his pool party.
The girl, dressed in a sparkly gold bikini, put her arms around Charlie's neck and, at one point, it appeared they were kissing each other.
Ferne has since tweeted: "Thank you everyone for your supportive and lovely comments. Means so much xxx"
She added: "Today is a new day..."
Thankyou everyone for your supportive and lovely comments. Means so much xxx— Ferne McCann (@fernemccann) July 29, 2013
Ferne's close friend and co-star, Sam Faiers, has also taken to Twitter to comment on Charlie's behaviour in Ibiza.
After seeing the pictures, published by the Daily Mail, Sam said: "I cannot believe BOYS .. I'm disgusted!!!! Love u @fernemccann, makes me sick."
Lucy Mecklenburgh, who had her fair share of troubles with ex-boyfriend Mario Falcone, replied, saying: "@SamanthaFaiers @fernemccann OMG! They're all the same!!! #prick."
Charlie, meanwhile, has not commented.
Last week, Ferne, Sam and Lauren Pope enjoyed a girls' holiday in Ibiza, but they headed home as Charlie flew there for Joey's birthday with Mario, Tom Pearce and James 'Diags' Bennewith.
While there, Ferne had tweeted: "Miss my prince @charlessims_ I never spend a night without him, love u x."
Will you be watching TOWIE when it returns? Tell us below, as the best comment from across the website each week wins £50!
Michelle Keegan, TOWIE, Rochelle Humes: yesterday's top headlines in pictures
Copyright: WENN Steve Searle