An aspiring actress has walked free from court despite viral footage emerging of her allegedly punching a police officer in the face.

Claire Helen was captured on CCTV in December 2014 allegedly punching a female officer in the face before she was forcibly arrested in Sydney's Kings Cross.

But the 33-year-old aspiring model was set free on a technicality because the officer forgot to ask her what her name was during the arrest, reports Yahoo News.

Claire Helen was captured on CCTV allegedly punching a female officer in the face (left) before she was forcibly arrested (right)

Ms Helen denied ever hitting the policewoman, instead accusing her and the other officers in the footage of police brutality.

'It's been a long time coming, so it's a really nice relief,' she said outside court. 'I didn't strike anybody.'

Ms Helen was with a group suspected of assaulting a taxi driver when they were approached by a group of police in the inner east Sydney suburb, with CCTV footage capturing the dramatic scenes.

Magistrate Graeme Curran dismissed the charges against Ms Helen because the officer did not ask Ms Helen what her name was before asking for her physical ID, which is police protocol.

The aspiring model and actress was set free on a technicality because the officer forgot to ask her what her name was during the arrest

Ms Helen denied ever hitting the policewoman, instead accusing her and the other officers in the footage of police brutality

The magistrate found it 'must' have been Ms Helen who struck the officer but said the prosecution had not been able to prove the police were in proper execution of their duties when the act occurred.

He read evidence from witnesses who described a 'rigorous' struggle between Ms Helen and police.