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She has been showing her support for her younger sister Petra Ecclestone since details of her bitter divorce battle from estranged husband James first surfaced.

And Tamara Ecclestone, 33, continued to rally around her sibling, as she stepped out with her husband Jay Rutland and daughter Sophia, three, to join Petra, 28, for lunch in London on Saturday. 

The British model's famous father and Formula One chief executive Bernie Ecclestone, 86, was also present, along with his wife Fabiana Flosi. 

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Doting mother: Tamara Ecclestone, 33, was seen clutching onto her daughter Sophia, three, as she left a family lunch with her husband Jay Rutland and father Bernie Ecclestone

Cutting a glamorous figure for their lunch date in the capital, Tamara sported a plain black jersey dress that sheathed her frame and featured stylish slits on either side that reached up to above the knee. 

The socialite wore her long brunette locks down past her shoulders in a perfectly blow-dried style and appeared to be sporting a subtle make-up look. 

She accessorised her casually chic attire with a large pair of shades and decided against stepping out in a pair of heels, adorning her feet with a pair of Rolling Stones inspired Vans instead. 

In a sweet display, her daughter Sophia was sporting similar footwear, as she rocked a pair of floral printed Adidas trainers. 

Support: The Ecclestone family have continued to rally around Petra as she is currently in a  bitter divorce battle with estranged husband James Stunt

Casually chic: Tamara put on a stylish display in a flattering jersey dress that sheathed her svelte frame and chic sunglasses

The tot was clad in a navy blue dress and matching cardigan and was cutely sporting her Frozen themed backpack on her back - no doubt containing a slew of goodies to keep her entertained throughout the luncheon.  

Clutching onto Sophia's hand, Tamara made sure to keep an eye on her mini-me as she left the London eatery with her family in tow. 

She was joined by her husband Jay who cut a dapper figure in a double denim ensemble. They had tied the knot back in 2013 and welcomed their daughter a year later. 

Reunited: She was seen kissing her father's wife Fabiana Flosi goodbye as they left the London eatery

Show of love: Formula one chief executive Bernie planted a kiss on his youngest daughter Petra as they parted ways

Tamara's father Bernie was seen strolling beside his wife Fabiana, who opted to wear a tailored wrap-over shirt, complementing jeans and leather nude ankle boots for their outing. 

Petra, meanwhile, kept a low-key figure as she hid underneath a black fedora hat. 

She left her blonde tresses loose underneath and covered up in a statement leopard print coat, sporting a pair of Gucci fur-lined loafers on her feet. 

Their family meal comes after it came to light that Petra is divorcing the father of her three children, six years after their lavish £12million wedding ceremony which took place in an Italian castle.  

Over: Their family meal comes after it came to light Petra is divorcing the father of her three children, six years after their lavish £12million Italian marriage ceremony

'He has caused enough': Bernie recently spoke for the first time about his daughter's divorce, telling MailOnline: 'She has suffered an awful lot and I couldn't bear for her to suffer any more'

She is embroiled in a bitter battle with her estranged husband over their £5.5billion fortune.

The pair have hired some of the country’s most high profile divorce lawyers to represent them in High Court hearings, which are expected to start next month.

Their £158million mansion in Los Angeles and a Grade II-listed pile in the fashionable west London district – worth up to £100million – are expected to be just some of the assets fought over.

Bernie spoke last week for the first time about his daughter's divorce from her husband James, telling MailOnline: 'She has suffered an awful lot and I couldn't bear for her to suffer any more'.

He added: 'I don't like to see marriages broken up unnecessarily, she tolerated it for quite a long time. He has caused enough aggravation for Petra'. 

Shedding light on the court hearing Petra had with husband James last month, Bernie said: 'It wasn't a divorce hearing, it was simply for Petra to be able to go back to her house. The case was for the judge to tell him to leave'

Extraordinary details of their bitter marriage were laid bare during a highly charged court hearing last month.

F1 boss Bernie said: 'It wasn't a divorce hearing, it was simply for Petra to be able to go back to her house.

'The case was for the judge to tell him to leave. It is a rather super house to live in which he would like people to believe he owns but he doesn't'.

A friend of Petra’s sister Tamara said: ‘The marriage has been terrible for a year and tricky for two.

'When your best friend is your sister': Tamara has been a close support for Petra throughout her divorce and shared a defiant selfie with her sibling to Instagram

'Slavica [Petra’s mum] and Tamara have been worried sick for ages and the whole family has felt that he traded on the Ecclestone name.’

Tamara, meanwhile, had showed her support for her sister on Instagram and shared a defiant selfie of the two together in light of Petra's relationship woes. 

She could be seen posing with her arm around Petra, as the girls put their heads close together to showcase their special bond that was personified by Tamara, as she wrote: 'When your best friend is your sister.'  

Petra and James had dated for four years before tying the knot at Odescalchi Castle, located near Rome, in August 2011. 

The pair are parents to daughter Lavinia, four, and two-year-old twin sons James and Andrew. 

Happier times: Petra and James (pictured above in May 2011) had dated for four years before tying the knot at Odescalchi Castle, located near Rome, in August 2011