The 'mystery blonde' woman pictured nuzzling the neck of Jeremy Corbyn's spin doctor is an Australia star lawyer who represented Julian Assange and is best friends with Amal Clooney.

Jennifer Robinson, 36, was photographed cosying up to father-of-two Seumas Milne, 59, on the terrace of a five-star east London hotel.

Miss Robinson, from New South Wales, Australia, is described as Amal Clooney's best friend having worked together as human rights lawyers including at Julian Assange's extradition hearings.

The 36-year-old was carried to the Clooneys’ star-studded Venetian wedding in 2014 in a boat with Bill Murray and asked to carry out bridesmaid's duties.

A witness to the hotel liaison, believed to be last Thursday evening, told the Guido Fawkes blog: 'They were there for a good hour or so. They were very hands on, full on heavy petting'.

Labour's Seumas Milne was spotted with human rights lawyer Jennifer Robinson at a hotel in Shoreditch, East London, pictured

Miss Robinson, 36, was photographed cosying up to father-of-two Mr Milne, 59, who is also married

Ms Robinson (right) has worked on Wikileaks founder Julian Assange's legal team since October 2010 and is best friends with Amal Clooney - pictured right in the background

Ms Robinson, left, is a close friend of Amal Clooney and attended her wedding to George in 2014. She is pictured with fellow guest Bill Murray arriving in Venice via boa

Before her recent intimate moment with Mr Milne, it appears she was already a fan and congratulated him on becoming Labour's top spin doctor with the message: 'This is brilliant news for @jeremycorbyn. Congrats @SeumasMilne!'.

Miss Robinson also hailed last month's 'thrilling' election result in a number of pro-Labour tweets and her barristers' chambers Doughty Street represented Mr Corbyn at the High Court during one of his leadership battles.

Miss Robinson joined Mr Assange's legal team in October 2010, two months after authorities in Sweden issued a European arrest warrant for the Wikileaks founder in relation to rape and sexual assault allegations.

Mr Milne, who worked for The Guardian before becoming Mr Corbyn's spin doctor, is married to private tutor Cristina Montanari, 60.

He and Ms Robinson were pictured yesterday at a table in a public area of the five-star Courthouse Hotel's balcony.

Ms Robinson has acted as Mr Assange's spokesperson during his failed battle against extradition, although the charges against him in Sweden were dropped this year.

According to The Times, Ms Robinson was stopped from boarding a flight at Heathrow Airport in April 2012 when she was 'told she was on a watchlist preventing her from travelling', although the Australian government denied any involvement.

She now works for Doughty Street Chambers in London, which represented Jeremy Corbyn last year in the High Court during his battle to ensure he was included on the ballot for a Labour leadership challenge.

It is unclear how the pair met, but an embassy source told The Times Mr Milne has visited Assange at the Ecuadorean embassy in London in the past 16 months.

Ms Robinson appears to be a supporter of Jeremy Corbyn according to her Twitter account, on which she praised the Labour leader for his performance in the general election last month and described the result as 'thrilling'.

Mr Milne is the strategy and communications director for Labour and Jeremy Corbyn (right)

She congratulated him on becoming Labour's to spin doctor with the message: 'This is brilliant news for @jeremycorbyn. Congrats @SeumasMilne!'

Human rights lawyer Jennifer Robinson, pictured left and right, is understood to be the woman pictured with Mr Milne at the east London hotel

She also served as a spokesperson for Mr Assange and previously worked in media defence, representing the New York Times and CNN

Ms Robinson is a close confidante of Amal Clooney and looked glamorous in a black dress at the glitzy event in 2014

Miss Robinson is offered a glass of fizz by a member of the Clooney wedding party in 2014

She grew up in the small town of Berry, NSW, Australia and graduated with a double degree in law and Asian studies from the Australian National University.

Ms Robinson went on to become a Rhodes Scholar at Oxford University, attending Balliol College and graduating with a Bachelor of Civil Law with Distinction and a Master of Philosophy in International Public Law.

She previously worked at London law firm Finers Stephens Innocent LLP, where her practice was largely media defence, freedom of information and free speech litigation, acting for clients such as the New York Times, CNN, Associated Press and Bloomberg.

Her current firm was founded by another Australian-born ex-Rhodes Scholar Geoffrey Robertson QC, with whom she has worked with for more than six years and has tackled issues including arguing for an Australian Bill of Rights.

She also provided international human rights advice, including on humanitarian issues in post-conflict Iraq, extraordinary rendition and international criminal law.

It is through this line of work that she is understood to have become friends with Amal Clooney. Ms Robinson was photographed at the star couple's A-list wedding in Italy in 2014 alongside Hollywood legend Bill Murray.

Mr Milne - the Labour Party's strategy and communications director - headed back inside the hotel with Ms Robinson after they were pictured on the balcony.

A witness told The Sun: 'He was drinking a pink cocktail and she was in her early to mid-30s. We were at a work event that had half the terrace booked off.

Ms Robinson, pictured, appears to be a Labour supporter after praising the party and leader Jeremy Corbyn over its performance in the general election

Ms Robinson, pictured left and right with Assange, had a table to themselves in a public area of the five-star Courthouse Hotel's balcony and she nestled her head into his shoulder, one witness claimed

Her appearance at the Clooney wedding may have given her a taste for the celebrity lifestyle after she was pictured waving to people alongside Bill Murray

'They had a table to themselves in the public section of the balcony. At one point she had her head nestled into his shoulder.'

Mr Milne lives in a £2million house in Richmond, South West London, and married Ms Montanari in 1992, with whom he has a now-adult son and daughter.

He left his role as senior Guardian journalist in October 2015 to become Labour's communications chief, although some moderate MPs criticised the appointment.

Oxford-educated Mr Milne was a keen supporter of Mr Corbyn and has written extensively on links between Western foreign policy and terrorism.

Ms Montanari works as a private tutor preparing children for selective school entrance exams in Richmond, as reported by Heat Street.

The couple controversially sent their children to the Tiffin grammar schools in Kingston rather than local comprehensives before they both went on to Oxbridge universities.

Mr Milne, 59, is married with two children

The Left-wing reporter has also previously written books about Margaret Thatcher's 'secret war' against the miners, global politics and economic policy

But the appointment was described by MP Simon Danczuk as 'totally bizarre' and leading Blairite John Woodcock said voters 'deserved better'.

Mr Milne worked for The Guardian for 32 years and was associate editor when he left.

He previously worked as a columnist, comment editor and labour correspondent for the paper but his appointment was criticised by some over comments he made in an article about the murder of Lee Rigby in 2013.

Mr Milne wrote that the attack was 'not terrorism in the normal sense' because of the soldier's service in Afghanistan, and said the public should not have been shocked by 'blowblack' with the 'surprise being there haven't been more atrocities'.

He was also questioned over his stance on Russia after he was pictured shaking Vladimir Putin's hand while at a 'propaganda summit' in Sochi.

But he appears to have won over many of his critics within the Labour Party following the success of the general election.

MailOnline has contacted Labour about the photos. Asked for comment by Sun reporters Stephen Moyes and Tess De La Mare, Mr Milne replied: 'I don't think so.'

The Times said it approached both Ms Robinson and Mr Milne for comment but neither responded.

The Courthouse Hotel, which has rooms costing up to £2,000 a night and a 4.5-star rating on TripAdvisor, is based in an old court and jail that held the Krays.

The 128-room hotel in the Grade II-listed building opened only last year at a cost of £40million, with the Edwardian courthouse closing in the late Nineties.

The Courthouse Hotel also has a 200 seat cinema, a bowling alley, an underground swimming pool and a social working space for local businesses.