Kris Jenner's kids are planning a "special family celebration" for her 70th birthday

A source told People: "You'd never think she is 70. Sure, she looks amazing, but it's her energy that stands out. She has this nonstop enthusiasm for life."

Kris - who had Kourtney, 46, Kim, 45, Khloe, 41 and Rob, 38, with late husband Robert Kardashian, as well as Kendall, 30, and Kylie, 28, with ex Caitlyn Jenner - is said to be "so involved with her kids and grandkids".

The insider added: "She's just one of those people who makes everything feel exciting."

Meanwhile, Kris previously hailed her cosmetic surgeon as a "class act".

The reality star heaped praise on Dr. Garth Fisher after Kylie Jenner revealed that the Los Angeles-based surgeon was responsible for her breast enlargement.

After Kylie praised Dr Fisher's work, the surgeon wrote on Instagram: "I'm honored to be acknowledged by Kylie-her kind words were unexpected but truly appreciated.

"Patient confidentiality has always been the foundation of my practice. Over 3 decades, we've never had a single breach. My entire team is thoroughly trained and bound by strict NDAs and confidentiality agreements.

"This is more than policy-it's our culture.

"HIPAA (patient privacy) laws are in place to protect patients, and I will never discuss any details of a procedure or procedures unless the patient has chosen to share them or given me permission to discuss.

"Every patient is unique. This isn't "cookbook" surgery-it's thoughtful, personalized care.

"Thank you for your trust and understanding.

"Garth Fisher, M.D. (sic)"

Kris subsequently took to the comments section to heap praise on Dr Fisher.

The reality star also revealed that Dr Fisher was responsible for her "first facelift in 2011".

Kris replied: "Garth you are such a superstar class act!! You did my first facelift in 2011... 14 years ago!!! and made it the most amazing experience ever and even gave us access to film so that others could get a peek inside what it's like and not be afraid... you have taken great care of us always and remain such a close and treasured friend!! Such an incredible talent!! [heart and prayer emojis] (sic)"