London calling! Kyle Richards arrives in UK for niece Nicky Hilton's wedding...but sister Kim is conspicuously absent

It's one of the most spectacular weddings London has seen for some time, and of course Kyle Richards was there to see her niece walk down the aisle.

The Real Housewives of Beverly Hills star who has just enjoyed a luxury break taking in the sites of the Italian Riviera on a yacht, was in London on Friday for Nicky Hilton's wedding.

The 45-year-old posed for an Instagram snap with her daughters, standing next to an iconic red telephone box.

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In London town! Kyle Richards took to Instagram on Friday showing she was in the UK capitial for her niece Nicky Hilton's wedding

In London town! Kyle Richards took to Instagram on Friday showing she was in the UK capitial for her niece Nicky Hilton's wedding

She captioned the photo simply: 'London'  and was photographed with Portia, Sophia and Alexia.

However one person who seems to be conspicuously absent from the celebrations is Kim Richards.

The sister of Kyle and Kathy, 56, is reportedly seeking treatment in a rehab facility after she fell off the wagon at her daughter Brooke's wedding in Mexico in May.

According to TMZ she was under the influence of either drugs or alcohol at the event and she got angry at her daughter and insulted the groom's family.

Not there: One person who seems to be conspicuously absent from the celebrations is Kim Richards Kyle and Kathy's sister

Not there: One person who seems to be conspicuously absent from the celebrations is Kim Richards Kyle and Kathy's sister

Support: Her ex husband Monty Brinson has been posting positive affirmations about the reality star on social media, suggesting she could be back in rehab 

Support: Her ex husband Monty Brinson has been posting positive affirmations about the reality star on social media, suggesting she could be back in rehab 

Caring: He also posted a loving message on Instagram on Friday to his niece, as he cannot attend the ceremony due to his own ill health

Caring: He also posted a loving message on Instagram on Friday to his niece, as he cannot attend the ceremony due to his own ill health

And E! News reported she was in a rehab facility before she went to the ceremony, taking time out to go to Mexico for the nuptials. 

Her ex husband Monty, who is also absent because of his ill health has been posting positive affirmations about her former wife on his Instagram page in the last week, suggesting she is currently getting treatment. 

Just four days ago he put the message: 'There are so many people out there pulling for you and just remember you are loved by many. Always stay strong and don't let people walk over you or take advantage of you anymore.'

Happy couple: Nicky, pictured here at her pre-wedding party on Thursday in London is tying the knot with James Rothschild

Happy couple: Nicky, pictured here at her pre-wedding party on Thursday in London is tying the knot with James Rothschild

Monty also seemed to suggest Kim had a new film coming out. 

However despite his absence from the ceremony, he took to social media to congratulate his niece on her happy day saying on Friday wishing the happy couple, and Nicky well.

He said: 'Today is a big day for you. Wish I could have been there with everyone to enjoy this special occasion in London. 

'I'm glad after all these years you are about to marry your best friend, soul mate and the love of your life. 

Sister act: Her sibling Paris will be playing a starring role in the ceremony - she was seen arriving at Claridges where the bridal party is staying on Friday

Sister act: Her sibling Paris will be playing a starring role in the ceremony - she was seen arriving at Claridges where the bridal party is staying on Friday

'It's also a big day for your parents as I should know when I walked Brooke down the isle. May the years ahead be filled with lasting joy. 

'Congratulations to a couple whose match truly seems made in heaven. Much love to you and your family.'

Preparations for the wedding have been continuing apace in London - the event itself is taking place at The Orangery in Kensington Palace, with some of the world's richest people set to be guests.

Chelsea Clinton, 35, James and Petra Stunt and Princess Charlotte's godfather Thomas van Straubenzee are thought to be among the invitees. 

The nuptials of Nicky, 31, to James Rothschild, is set to be a lavish affair, with the bride wearing a £50,000 Valentino gown which has of course been custom made. 

Grand surroundings: The ceremony is taking place at The Orangery in Kensington Palace 

Grand surroundings: The ceremony is taking place at The Orangery in Kensington Palace 

Big event: Marquees have been seen in the grounds

Big event: Marquees have been seen in the grounds

Preparations: flowers and tables arrived for the reception

Preparations: flowers and tables arrived for the reception

Her sister Paris, 35, has a starring role in proceedings, and has been seen out and about in the city attending a variety of parties and functions that have been happening in the run up to the big day. 

She was seen dressed in a chic blue maxi dress, sparkling high heels and a huge broad-brimmed hat arriving at Claridges Hotel on Friday.

Nicky has been staying there - and her mother Kathy was spotted on her way to the hairdressers earlier in the day and flowers and champagne were seen being wheeled into the venue,

The wedding will unite two of the world's wealthiest dynasties, with the Hiltons thought to be worth in excess of £1.5 billion.

The groom is one of the heirs to the British banking dynasty which has reportedly amassed a fortune worth around £12bn. 

Bouquets: Flowers for the bride arrived at Claridges early on Friday 

Bouquets: Flowers for the bride arrived at Claridges early on Friday 

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