As Hollywood heavyweight Sylvester Stallone boldly promotes his family's new reality TV series, whispers of concern are surfacing from the once-dominant Kardashian empire, according to industry insiders.

76-year-old Stallone, his wife Jennifer Flavin, 54, and their daughters Sophia, 26, Sistine, 24, and Scarlet, 20, are vigorously marketing their eight-episode show, "The Family Stallone." The show bears a resemblance to influential reality television classics such as "Keeping Up with the Kardashians" and "The Osbournes," headlined by the legendary rocker Ozzy Osbourne and his family.

Notably, while the Osbournes are reportedly indifferent about the emerging show, sources claim that Kris Jenner, the business-minded matriarch of the Kardashian clan, is deeply unsettled by the new Paramount+ production.

An insider revealed, "The Stallones project a more sophisticated and refined image than the Kardashians, which likely explains Kris's sense of alarm."

After a 13-year tenure on E!, 67-year-old Jenner recently penned a $100 million agreement for "The Kardashians" at Hulu. Yet, whispers from insiders suggest she lives with a lingering apprehension of their viewership declining and the risk of their reality TV reign being dethroned.

"With Sly and his family rising as a potential threat, it's a daunting prospect," shared a source.

GLOBE had previously reported that less than a year ago, Stallone's wife contemplated ending their 25-year marriage. However, the couple emerged from their rough patch more determined than ever, throwing their energies into their reality show.

Jenner is reportedly brainstorming strategies to stay relevant amid this competition. However, the Stallones present an allure that the Kardashians might lack, according to an industry tipster: "What sets the Stallones apart from the caricature-like Kardashians is an undeniable sense of class."