EXCLUSIVE: Melissa Rivers Reveals Where She Scattered Her Mother Joan Rivers' Ashes

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Melissa Rivers has found a meaningful place to scatter a few of her mother Joan Rivers' ashes.

The 47-year-old Fashion Police executive producer and now panelist revealed to ET that she scattered some of the comedic legend's ashes in Wyoming last month -- where she, Joan, and her 14-year-old son Cooper would take their annual vacation.

"Coop and I took our annual family vacation to Wyoming," Melissa told ET. "[The] first without my mom and scattered some of her ashes there so we can still be together every August as a family."

WATCH: Melissa Rivers Reveals Why Joan Had a Lifelong Obsession With Death

Melissa Instagrammed a few pictures of her Wyoming trip two weeks ago, specifically, of Cooper enjoying the picturesque settings. "We are back where the buffalo roam #wyoming #vacation," she wrote.

This Friday, Sept. 4, marks the one-year anniversary of Joan's death. She was 81 years old.

"Everyone expects me to have this big grand plan for the 4th and I am just going to be spending it with my son," Melissa revealed to ET. "He is going to go to school, I am going to go to work and come home and light a candle, and have a glass of wine."

Speaking of Cooper, Melissa also shared that her only child is experiencing a big milestone this year -- starting high school.

"I think the most important thing is that Cooper is OK," she said about her son starting the 9th grade. "For my mother, that would be the most important thing this year, that Cooper is OK. ... Cooper and I talk about what would be the best way to honor her legacy, and the best way to honor her legacy is to be OK."

Melissa talked about Joan's heartbreaking last moments with ET in May, and revealed how Cooper mourned the loss of his grandmother. "[Cooper] sat there and held her hand and had a good cry," Melissa recalled to ET's Nancy O'Dell. "He took his baseball hat and he put it in her hands and he said, 'Please make sure this stays with her.' And I made sure that it never left her side."

WATCH: Melissa Rivers Describes Joan's Last Moments -- 'I Held Her'

Now, Melissa is carrying on her mother's legacy on Fashion Police, stepping in as a panelist after both Kelly Osbourne and Kathy Griffin exited the program earlier this year. She actually had her first episode on Sunday, taking on the wild styles at the MTV Video Music Awards.

Watch the video below to see Melissa displaying some of Joan's bite and cutting wit