Sister act! Paris Hilton shares photo of her mother Kathy looking happy with RHOBH siblings Kim and Kyle after persistent rumours of strife 

Kyle, 47, Kim, 51, and Kathy, 57, all grew up together in Beverly Hills under stressful circumstances.

And their sibling rivalry continues as Kim has battled addiction issues while Kathy and Kyle reportedly duke it out over their husbands' real estate squabble (it has been claimed Mauricio Umansky took clients and agents from Rick Hilton when he set up The Agency).

But on Wednesday all seemed fine between the 90210 girl squad as evidenced by a photo shared to Instagram by Kathy's daughter Paris Hilton.

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Family first: Kathy, Kim and Kyle looked like three happy sisters in this shot shared by Paris Hilton on Wednesday

The three amigos: (from left) Kathy Hilton, 57, Kim Richards, 51, and Kyle Richards, 47

Before the drama: The 90210 squad all prettied up at the QVC at Four Seasons Hotel Los Angeles at Beverly Hills in 2012

 In the image Paris is seen sitting to the far left in a striped dress with her hair down. Kim, Kathy and Kylie are standing in the background.

Also in the photo are Paris' cousins, including Whitney and Farrah.

The blonde DJ's caption read: 'Amazing evening celebrating with the #BirthdayGirl @WhittlesDavis @KathyHilton @KimRichards11 @KyleRichards18 & @FarrahBritt!'

She added: 'Love my family❤️.'

More smiles: Paris with Kyle, Kathy and Kim doing Extra at The Grove in 2012

The tension seemed to boil over for the three sisters during Nicky Hilton's wedding in 2015. There was talk Kyle would not attend the nuptials because of the fight between her husband Mauricio and Kathy's spouse Rick.

There is also the problem of Kim, who has had some big highs and lows.

On Tuesday's Watch What Happens Live she addresses her past with host Andy Cohen. 'I'm doing great, I'm in recovery,' said Kim who wore a black dress with a white collar and matching cuffs. 

Special edition: Kim made a special One-on-One appearance on Watch What Happens Live on Tuesday

Andy later asked Kim about her arrest in August 2015 for allegedly shoplifting at a Target store in the San Fernando Valley area of Los Angeles.

'It's a legal issue and I can't discuss that. Sorry,' Kim said.

Andy followed up by asking about her April 2015 arrest at the Beverly Hills Hotel for trespassing, public intoxication, resisting an officer and battery on a police officer.

'I drank that night, you know? No excuses,' Kim said.

The host: Andy Cohen thoughtfully offered condolences to Kim over the death of her ex Monty Brinson at the start of the show

The Real Housewives Of Beverly Hills star said she had been sober for three and a half years before her relapse.

Kim said she was coping at the time with her son Chad Davis being sick, her ex-husband Monty Brinson battling cancer and co-star Lisa Rinna riding her on RHOBH over substance abuse suspicions.

Monty died of cancer aged 58 in January and Andy opened the show by offering his condolences to Kim.

Bravo show: Kim sat down with Andy for a special One-on-One interview

Kim said her relapse started when she had a glass of wine with an unidentified girlfriend about two weeks before her arrest.

That was followed by a glass of wine at her daughter Brooke's house the night of her arrest.

'I felt horribly guilty and I thought, ''I need to go home,'" Kim said.

'She only lives a block-and-a-half from the hotel, so I left and I realized, ''Oh, my God. I can't drink and drive. What have I done?'' So, I pulled into the hotel and when I pulled into the hotel I went in,' she continued.

Relapse recount: The reality star talked about her arrest at the Beverly Hills Hotel

Kim said she insisted in sitting in her usual booth despite being told they were closing soon.

'I said, ''Please, I'm staying. I don't want to drive. I'm scared.' And he said, 'No, if you don't leave, we are calling the police.' And I really thought he was joking. And he called the police, and one thing lead to another,' Kim said.

Kim said the arrest turned out to be a blessing in disguise as it lead to a 30-day stint in rehab.

Mother and daughter show: Kim said she and daughter Kimberly were excited to be on The Mother/Daughter Experiment: Celebrity Edition

'I'm kind of relieved it happened. I needed a break,' she said.

Television worlds collided as Kim was asked by Andy about appearing with daughter Kimberly on the Lifetime reality series The Mother/Daughter Experiment: Celebrity Edition.

The latest episode of the mother-daughter reality therapy series also aired on Tuesday with a title 'Headlines Don't Lie...'.

Kimberly was asked during the episode about the headlines chronicling her mother's latest stint in rehab.