Kathy Hilton kept news about joining “The Real Housewives of Beverly Hills” secret from her own daughters.

On the latest episode of Paris Hilton’s podcast “This Is Paris”, the reality star welcomes sister Nicky Hilton.

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“Even though she’s my little sister, I’ve always looked up to her like a big sister… she’s the one that’s way more responsible, and always watching out for me and is so protective… she’s very intuitive and very strong,” Paris says off the top.

The sisters also talk about the documentary “Framing Britney Spears” and brought up Paris’ own ill treatment by the media, including a recently resurfaced interview with David Letterman.

“He just kept pushing me and pushing me and I was so upset,” Paris says of the clip. “It was like he was purposely trying to humiliate me… please stop bringing this up again… it was very cruel and very mean. I’m never coming on this show again, you crossed the line.”

Nicky later adds, “You know what would not happen today is Sarah Silverman going on stage at the MTV Awards, and making disgusting, vile, perverted statements about pop stars, about people sitting in the audience.”

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Paris says, “There were certain people they targeted. I would see that with myself, with Britney, Jessica Simpson. There was a certain type of girl they targeted that they’d never do that to a man.”

Nicky dished on Paris’ recent engagement to Carter Reum and how he asked for her permission hours before he popped the question.

“So, we were at lunch and you got up from the table to go and use the bathroom, and he got up and came and sat next to me and said ‘I have two quick questions,’ ” Nicky said.

She then recalled how after she told Reum “yes”, he then asked for Nicky, her husband James Rothschild and brother Barron to join them on the beach for the proposal.

“I quickly said yes to both and we got dressed and we were down hiding in the beach,” Nicky said, but since Paris was late, they almost had to hide in a bush for 45 minutes. Luckily, Nicky knew her sister better.

“I was like, ‘I am not sitting in the bushes, boiling at 5 p.m., because there’s no way she’s going to come down,’ ” Nicky recalled. “‘Text me when you’re going down and then I’ll start heading over, because I know her.'”

Sure enough, Paris was late but it all worked out in the end as she said yes.

Finally, the sisters talk about mom Kathy joining the cast of “RHOBH” last fall, revealing that she didn’t actually tell them she would be going on the reality series.

Nicky says their mom was “so shady about the whole thing,” recalling she told them, “Well they asked me, and I’m thinking about it, but I’m probably not going to do it.”

Paris says, “My mom lied to us and said she wasn’t doing it. If there wasn’t a pandemic, there’s no way she would say yes,” to which Nicky added, “She’s bored and looks better than ever, so I feel like, she’s like why not.”