Kathy Hilton says daughter Paris Hilton, 43, and longtime pal Nicole Richie, 42, are still like 'two little kids'... as they reboot The Simple Life

Paris Hilton, 43, and Nicole Richie, 42, are businesswomen, reality TV stars, wives, mothers and socialites.

But when they get together they act like little kids, according to Paris' mother Kathy Hilton, 65.

The Real Housewives of Beverly Hills star dished about the close bond the childhood friends share.

She told UsWeekly at the Ladies Who Longevity Lunch, which Kathy - who jetted to Italy with daughter Nicky Hilton recently –hosted.

'You know what is great is when they get back together, it's like they're still 12 years old,' she said.

'When they get together, it's just, like, they're two kids,' she gushed.

Paris Hilton and Nicole Richie are businesswomen, reality TV stars, wives, mothers and socialites at 43 and 42-years-old

But when they get together they act like little kids, according to Paris' mother Kathy Hilton, 65, Paris pictured in 2024

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Paris Hilton and Nicole Richie are returning to reality TV... 20 years after The Simple Life

Paris and Nicole showed the world their friendship on 2003's reality TV show where the hotel heiress and daughter of music megastar Lionel Richie got to see how the other half lived – often to high hilarity and awkwardness.

'For the first show, I sat them both down on the bed. I didn't know where they were going,' Kathy explained to the outlet.

'I was not for this at all … and I was wrong. It was the funniest show.'

And the proud mom rated her daughter's reality TV debut, calling it 'iconic.'

'It was without swearing, without fighting [and] it was really cute and fun and just silly and a lot like I am,' Kathy added.

Last month, news broke that Paris and Nicole were planning to reboot The Simple Life, 21 years after it first aired.

The premise of the series has not yet been revealed, though production sources shared that it's not going to be an exact copy of their former show, nor will it have the same name.

Paris and Nicole have already sold their pitch to Peacock after working out all of the scheduling issues so that they could work together again.

And Kathy is all in on the reboot, saying: 'I think it's going to be exciting. The two of them are a dynamic duo.'

Kathy at her party this week with sister Kyle Richards, far right, and pals

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'You know what is great is when they get back together, it's like they're still 12 years old,' she said. 'When they get together, it's just, like, they're two kids,' she gushed

Paris revealed to Us Weekly earlier this month what fans can expect on the new show. 'I'm so excited to do this with Nicole,' the Paris in Love star gushed, pictured in 2001

Paris revealed to Us Weekly earlier this month what fans can expect on the new show.

'I'm so excited to do this with Nicole,' the Paris in Love star gushed.

'We have been best friends since we were two years old. So many of my best and most fun memories are with her,' she explained.

'What we created together is so special and this is just going to be so iconic. I am so excited to do this for all the fans.'