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The funeral for Lee Radziwill was held Monday in New York City. She died on February 15, of natural causes after suffering from an 'age-related disease' Pictured: Lee in 2011

A private Requiem Mass was celebrated Monday morning for socialite and ex-princess Caroline Lee Bouvier Radziwill at St Thomas More Church on Manhattan's Upper East Side.

The younger sister of the late former First Lady Jacqueline Kennedy Onassis passed away on February 15 of natural causes. She was 85.

Family and friends nearly filled to capacity the 250 seat, 19th-century Gothic Revival architectural style Catholic church to remember and say their good-byes to the style icon. 

Among the mourners at the invitation-only service were Lee's only surviving child, Anna Christina (her son Anthony predeceased her in 1999); former daughter-in-law Carole Radziwill, who arrived solo on foot; niece Caroline Kennedy Schlossberg, her husband Edwin and Marta Sgubin, Jackie's longtime housekeeper and cook, all exiting the same SUV. 

Also attending were Sofia Coppola, sneaker wearing fashion designer Marc Jacobs - vaping as he entered the church - as well as Carolina Herrera and her husband Reinaldo. They arrived in a chauffeur driven sedan with their pooch in the front passenger seat.  

The hearse carrying Lee's body idled for a period on the street leading up to the church before pulling slowly up out front doors at 10.03am. Her flower bedecked wicker casket was carried inside by pallbearers from the Frank E Campbell Funeral Home, the same outfit that handled Jackie's funeral in 1994. 

Getting out of a car directly behind the hearse was Lee's daughter, Anna Christina. She followed her mom's casket up the steps and into the church for the service. 

The Reverend Kevin V. Madigan was the celebrant. Anna Christina read the E.E. Cummings poem 'Maggie and Milly and Molly and May,' and family friend Hamilton South gave he eulogy. The first reading from the Book of Wisdom 3:1-9 was read by Sofia Coppola. Toward the end of the service 'Amazing Grace' was sung by Susanna Phillips.

Larger than life Andre Leon Talley, the retired Vogue fashion editor was an early arrival as was the socialite Deeda Blair. 

Talley told DailyMail.com  that 'Lee was an extraordinary woman. This very dignified service was the perfect celebration of her extraordinary life.' He added that the 'Bouvier sisters, Lee and Jackie, were the closest this country has ever come to royalty. Lee's passing marked the end of an era.' 

Caroline Kennedy and husband Edwin Schlossberg are pictured entering St Thomas More Church on Manhattan's Upper East Side Monday morning for the funeral of her aunt Lee Radziwill 

Real Housewives of New York star Carole Radziwill, Lee's former daughter-in-law, dressed in all black as she arrived to the church service 

Fashion designer Marc Jacobs was spotted smoking a vape and wearing sneakers as he made his way to the church Monday morning for the service of friend Lee Radziwill, who died at her home February 15

Marc Jacobs looked emotional as he left the funeral service for his longtime friend

Fashion designer Tory Burch wore pumps and a sunglasses as she walked the New York City streets alongside husband Pierre-Yves Roussel ahead of Lee Radziwill's funeral service

Andre Leon Talley, former editor at large for Vogue Magazine, looked fashionable as he walked toward Monday morning's funeral service. He told DailyMail.com it was a 'very dignified service' and 'perfect celebration of her extraordinary life'

Monday's funeral service was invite-only, with about 250 of the style icon and socialites closest family and friends in attendance 

The hearse carrying the body of Lee Radziwill is pictured arriving to Monday morning's service for the beloved socialite 

Lee Radziwill's wicker casket is carried out of the church after an hour-long memorial that the socialite helped plan herself 

The raspy-voiced three times divorced Radziwill outlived all of her husbands - her first, Michael Canfield, died in 1969. 

She then wed Polish aristocrat Prince Stanislas Radziwill, with whom she had her two children. He would pass on nearly two years after their 1974 divorce.

Her final try at marriage, to Herbert Ross, lasted 10 years until 1999, the same year as her son Anthony's cancer death at age 40.

Ross, a choreographer and award-winning director of 'Funny Girl' and 'Steel Magnolias' died two years later, in 2001.

St Thomas More is a longtime favorite place of worship for the Bouvier and Kennedy families.

Almost 20 years ago it was the setting for a memorial service for Lee's nephew John F Kennedy Jr and his wife Caroline, held 14 days after their tragic plane crash deaths on July 16, 1999. 

Jackie was also a regular parishioner. She had a Mass offered for her husband, assassinated president John F Kennedy, every November 22 on the anniversary of his death. 

The tradition was maintained by their daughter Caroline after Jackie's passing in 1994. 

An inside look of the St Thomas More Catholic Church where flowers are in place in for Monday's service and guest file in 

Sofia Coppola is pictured among the crowd as the hour-long funeral service lets out in New York City 

Fashion designer Carolina Herrera and husband Reinaldo braced the cold as they entered St Thomas More Church on Manhattan's Upper East Side Monday morning 

Andy Warhol protege Vincent Fremont, pictured left with his wife Shelly Dunn in the red head scarf, is pictured leaving the service. Journalist Diane Sawyer was also in attendance 

Lee was considered to be a style icon throughout her life. Her passion turned into a career when she worked as a PR executive for Giorgio Armani (pictured in 1976)

Marc Jacob posted this photo of a younger him with Lee Radziwill after news of her passing. 'Thank you for so many wonderful memories. Rest in Peace dear Lee,' the fashion designer captioned the photo 

Born Caroline Lee Bouvier in New York in 1933 to Janet Norton Lee and New York stockbroker and socialite John Vernou Bouvier III, Radziwill came from a famous family but established herself as a noteworthy figure in her own right.  

She boasted an exclusive list of close friends, from Andy Warhol to Truman Capote, and worked briefly as an actress before turning her hand to interior design and public relations. 

Jackie and Lee, were two of the most glamorous women of their generation, but their closeness came with a fierce rivalry.  

From a young age the pair pitted themselves against one another, with Lee regarded as the 'pretty one', and Jackie the 'smart one'. 

The competition went on throughout their lives: 'Who's going to be more popular? Who will marry first?'' said Randy Taraborrelli, the author of 'Jackie, Janet and Lee', to People.  

In her book 'Happy Times', Lee remarked: 'One always looks up to older siblings for guidance. One tries to emulate them and follow their achievements. That's what I did with my sister.' 

Caroline Kennedy and husband Ed Schlossberg are pictured leaving the memorial for her aunt Lee 

Founder of Rolling Stone Magazine Jann Wenner, far right in a purple scarf, exits the church among 250 other mourners 

American photographer Peter Beard was assisted down the steps of the church following the service for his longtime friend and former lover. His wife Nezda trailed behind him 

St Thomas More Church is a longtime favorite place of worship for the Bouvier and Kennedy families

Socialite Deeda Blair wore a purple coat and held her gloves and bag as she headed to the funeral of her longtime friend 

Marta Sgubin, longtime nanny to the Kennedy children, exits a car with Caroline Kennedy ahead of the mass for Lee Radziwill

 Fashion editor Candy Pratts Price and artist husband Chuck Price arrived for the service to remember an icon 

Caroline Kennedy, the only surviving child of JFK and Jackie O, was spotted leaving her home to head to the funeral for her aunt Monday 

Caroline Kennedy, pictured leaving her New York home, is an author, activist, diplomat and one of the most prominent surviving Kennedys 

Tatiana Schlossberg, daughter of Caroline Kennedy, inside the gates of the church ahead of her great aunt's funeral 

Designer and friend Jeffrey Costello walked the streets of New York as he headed to Monday's funeral 

Psychiatrist and socialite Samantha Boardman arrived solo to the funeral service 

Martine Assouline, of Assouline Publishing, was spotted Monday morning in all black and sunglasses to mourn the loss of Radziwill 

Jackie Kennedy's sister Lee Radziwill (pictured left in 1967, right in 2016) died age 85 at her home in New York City

But the contention came to a shattering crescendo when Jackie became First Lady in 1961.

'How can I compete with that?' Radziwill reportedly said during a function at Buckingham Palace. 'It's all over for me now.' 

After JFK's assassination, Radziwill left a note on Jackie's pillow that read: 'Good night my darling Jacks — the bravest and noblest of all. L.'

As Jackie lay dying of cancer in 1994, Radziwill clambered to be at her sister's side and told her 'I love you so much. I always have, Jacks. I hope you know it.'

Before her retirement, Radziwill served for many years as a Public Relations executive for Giorgio Armani.

She was a stalwart attendee of New York Fashion Week, and regularly attended other fashion events around the world right up until her death.  

'Regrets? I think everyone has regrets, and people who say they haven’t are either liars . . . or narcissists' Radziwill said to the New York Times in 2013.

'There have been many things in my life to have regrets about, in the sense I wish I could have changed them, or somehow made them not happen,' she continued.

'What I don’t have is envy. I’m perfectly content at this time of my life. I’ve done so many fascinating things and the greatest joy is that I continue to do interesting things and meet fascinating people.'

The First Lady of the land, Mrs. Jacqueline Kennedy, and her sister, Lee Radziwill (right) were considered the world's most famous sisters during the 1960s