The 22-year-old singer is currently filming his part in the war movie but has been given extra security to ensure he is kept safe, reported Daily Mirror.
"Harry has to have a full-time bodyguard to follow him around because fans have been breaking onto set to see him. He's the only person who has a security guard at his side round the clock, but his minder follows him home too," a source said.
"The fans managed to find out where he's staying and have been camped outside his hotel even when he's not even there. Harry is the only cast member with personal security. Nobody else has extra staff apart from Kenneth Branagh. He has a driver, but thats it.