September 8, 2021 | 1:07pm

From fan to BFF.

“Real Housewives of New York” star Leah McSweeney sat front row at the Christian Siriano fashion show on Tuesday — placed next to her “idol” Lil’ Kim, kicking off New York Fashion Week with a bang.

McSweeney first declared her love of the “Magic Stick” singer during NYFW last year, when she wore a tube dress covered with Lil’ Kim’s mugshot, designed by Rxch, to co-star Sonja Morgan’s fashion show.

It appears that the public declaration of love helped the Married to the Mob founder get closer to the rapper; McSweeney revealed to Paper Magazine earlier this year that she has since had dinner with the star.

“The Lil’ Kim dress, that was my favorite moment because I saw that dress online and was like, ‘This is so cool. I love supporting new, young, up-and-coming designers and I f—king love Lil’ Kim, so it was literally perfect,” she said in June.

“I get to talk to Lil’ Kim and say ‘I love you so much, I am wearing you all over my body,’ and I got to have dinner with her actually this year. She has been like my idol since I was 13 years old.”

For the occasion, McSweeney wore a pair of sheer black fringe-embellished pants with a matching blazer over a “Siriano Mob” T-shirt that matches the “Bitch Mob” T-shirt Rihanna wore in July after the Fenty founder’s name was invoked on the Bravo show.

Though the Bravolebrity was clearly excited to sit next to the rapper, they duo was joined by a ton of other celebrities, including Alicia Silverstone, Katie Holmes, “RuPaul’s Drag Race” star Aquaria, Kristin Chenoweth and more.