Sienna Miller enjoys a day out with longtime pal Archie Keswick at Wimbledon

Sienna Miller attended day seven of Wimbledon alongside her longtime pal Archie Keswick on Monday, one month after they were seen holding hands in NYC.

The actress, 39, looked stunning for her day out as she was seen with her suited and booted pal in an outing that comes just months after they were pictured enjoying a cosy stroll around Hudson River Park.   

Layer Cake star Sienna, who split from her third fiancé Lucas Zwirner back in September 2020, was beaming as she enjoyed a day in the sun watching the tennis alongside Archie and a number of other pals.

Back then: She was seen walking hand in hand with Archie in New York in May

Out and about: Sienna Miller attended day seven of Wimbledon alongside her longtime pal Archie Keswick on Monday, one month after they were seen holding hands in NYC

Sienna looked sensational for the day at Wimbledon as she wore a chic blue and white striped two-piece which complemented Archie’s sleek look.  

The actress is thought to be an old friend of Archie, with him being named in legal documents relating to the 2010 phone hacking scandal, reports the Guardian

He is the son of Simon Keswick, former director of multi-billion pound Hong Kong conglomerate Jardine Matheson – owner of the Mandarin Oriental Group. 

Old Etonian Archie is listed as a board member of the Mandarin Oriental Intl Ltd, the company behind the international chain of luxury hotels, on Bloomberg’s website

Out and about: The actress, 39, looked stunning for her day out as she was seen with her suited and booted pal in an outing that comes just months after they were pictured enjoying a cosy stroll around Hudson River Park

Out and about: The actress, 39, looked stunning for her day out as she was seen with her suited and booted pal in an outing that comes just months after they were pictured enjoying a cosy stroll around Hudson River Park

Stunner: Sienna looked sensational for the day at Wimbledon as she wore a chic blue and white striped two-piece which complemented Archie's sleek look

Stunner: Sienna looked sensational for the day at Wimbledon as she wore a chic blue and white striped two-piece which complemented Archie’s sleek look

Chatting away: Sienna and Archie appeared deep in conversation as they held hands during the walk back on 1 June

Chatting away: Sienna and Archie appeared deep in conversation as they held hands during the walk back on 1 June

The family has a private fortune of £6.35bn, according to the Sunday Times Rich List, and own a 18,000-acre estate in Angus. The Keswicks have controlled Jardine Matheson for five generations.

Now the group’s interests range from prime Hong Kong real estate and brands to Vietnam’s largest dairy producer.          

Archie, who was described as a ‘demon on the tennis court’ who ‘loves house music’ by Tatler, is the son of Simon and Emma Chetwode, daughter of Major George David Chetwode and Lady Willa Elliot-Murray-Kynynmoun.

Like his father, Archie was educated at Eton. He received an undergraduate degree from Edinburgh University. 

Showing to the seats: The duo prepared to take their courtside seats

Showing to the seats: The duo prepared to take their courtside seats 

Chic: She arrived alongside a large group which included Archie

Chic: She arrived alongside a large group which included Archie

Despite being from a billionaire family, Archie and his siblings – he has one brother, Ben, who is chairman of Jardine Matheson, and two sisters, Willa and Poppy – were made to understand the value of hard work growing up. 

‘He is the most incredible person in the world but he’s just not the kind to give out money at all,’ Willa said of her father in a 2011 interview with the Evening Standard to promote the opening of her Notting Hill shop, The Village Bicycle. 

It comes nine months after Sienna and her ex beau Lucas ended their relationship in September last year.

Break up: It comes months after Sienna split from her third fiancé Lucas Zwirner back in September 2020 (pictured 2019)

Break up: It comes months after Sienna split from her third fiancé Lucas Zwirner back in September 2020 (pictured 2019)

The actress and her ex, the son of art dealer David Zwirner, got engaged in January after a year of dating, but Page Six revealed they had called things quits.

The report claimed that it was the thespian who broke it off with the editor, though no reason for the separation was given. 

Representatives for both Miller and Zwirner did not respond to requests for comment from MailOnline at the time. 

Sienna was previously engaged to actors Jude Law, 47, in 2004 and Tom Sturridge, 34, the father of her daughter Marlowe, eight, in 2012. 

Ex: The blonde dated actor Tom Sturridge from 2011 until 2015 engaged in 2012 - the pair share eight-year-old daughter Marlowe Ottoline Layng (pictured together in 2013)

Ex: The blonde dated actor Tom Sturridge from 2011 until 2015, becoming engaged in 2012 – the pair share eight-year-old daughter Marlowe Ottoline Layng (pictured together in 2013)

In a 2017 interview with Harper’s Bazaar, Sienna spoke about maintaining a friendship with her ex, saying of Tom: ‘We still love each other.’ 

‘I think in a break-up somebody has to be a little bit cruel in order for it to be traditional, but it’s not been acrimonious in a way where you would choose to not be around that person.’  

‘We don’t live together, as has been reported recently, but we do half the time,’ she added. ‘Everybody will stay over or we’ll all go on holiday and that’s because we genuinely want to be around each other.’

‘It’s great for our daughter that she has two parents who love each other and are friends. He’s definitely my best friend in the entire world.’ 

A vision: Sienna looked sensational in a striped ensemble

A vision: Sienna looked sensational in a striped ensemble