Riley Keough welcomed her second baby with Ben Smith-Petersen earlier this year

Priscilla - who was married to Elvis Presley between 1967 and 1973 - told People: "I love her babies.

"I'm really happy for Riley. She's got an amazing husband and two great children, so I'm happy for her very much."

Priscilla also observed that Tupelo "lives in her own world".

The 80-year-old star said: "She does what she wants. She rules."

Tupelo actually started to talk before celebrating her first birthday.

Priscilla shared: "At my home, there's a pond right down below, and I'm holding her, and she goes, 'Pond'.

"She's not even a year going, 'Pond.' Then she looked, and she saw a car. I went to Lisa, and I said, 'Lisa, she's not even a year, and she's telling me all what's out there.' [Riley] was saying that her husband really spends a lot of time with her. She's a chatterbox."

Riley is the eldest daughter of the late Lisa Marie Presley, and she previously explained how her own parenting style differs from her mom's approach.

She said on the Call Her Daddy podcast: "I think she was such an amazing parent and she wanted us to have - I think her father did - these amazing experiences all the time.

"For me personally, I think that the problem there could be for some that when you're used to so much, it's hard to find joy in simple things.

"And so I really want my children to be able to find joy and just playing in the backyard and doing normal kid stuff and not need like elephants and circus and all these things all the time.

"So that's probably what I would do differently."

Despite this, Riley acknowledged that her mom did everything she could to be the best parent possible.

The actress - who has been married to Ben since 2015 - said: "I think her intention was really wanting to give everything she could to her kids."