Reese Witherspoon calls throwing ice cream at Meryl Streep a 'top 5 moment' (Exclusive)

Nearly every star in Hollywood has nothing but love for working alongside Meryl Streep, but for Reese Witherspoon, the highlight of the experience came when she got to pelt her with an ice cream cone.

Recently, a photo from the production of the upcoming second season of Big Little Lies showed the Wrinkle in Time actress angrily winding up to hurl a frozen confection at the back of Streep's head -- and the actress told ET that it was one of the best professional moments of her life.

"It's a Top 5 moment in my career, for sure," Witherspoon told ET's Brooke Anderson at the premiere of her new docu-series Shine On With Reese in Hollywood on Monday.

That's a big statement coming from a woman whose storied career includes a score of beloved characters, blockbuster movies and an Academy Award.

Streep joined Big Little Lies for the HBO drama's hotly anticipated second season, playing the mother of the late Perry Wright (Alexander Skarsgard) and mother-in-law to Celeste Wright (Nicole Kidman), who shows up to town after the death of her son.

However, before new episodes of Big Little Lies premiere sometime next year, Witherspoon's new series, Shine On With Reese, is currently airing on DirecTV's Hello Sunshine channel. The show features one-on-one interviews between Witherspoon and a number of different female superstar guests who open up about their careers and how they achieved their dreams.

The show's first guest was country music icon Dolly Parton, and Witherspoon dished on how sitting down across from the beloved "Jolene" songstress was particularly intimidating.

"Talking to Dolly Parton was really terrifying. I was so scared," Witherspoon shared. "She's been an idol of mine forever but it was great to be able to highlight women I've respected  -- and I love her so much -- and to bring those sort of intimate conversations that we have just as friends to the people, so I was happy to do it."

"I wasn’t scared of a lot of things but I'm a little scared of dolly just cause I didn’t wanna mess it up," she added. "She’s amazing and she was being so open and really letting me into her house and her closet and so it was a big opportunity… She’s really just as genuine and sweet as she seems."

Ava DuVernay, Pink,  America Ferrera and Kacey Musgraves are among a few of the other celebrities who sat down with Witherspoon for her new series.

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'Big Little Lies' cast at the Golden Globes
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'Big Little Lies' cast at the Golden Globes
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Reese Witherspoon arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Christopher Polk/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Reese Witherspoon attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Reese Witherspoon attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actor Nicole Kidman attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Keith Urban and Nicole Kidman attend The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Nicole Kidman attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Shailene Woodley arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Neilson Barnard/NBCUniversal/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Shailene Woodley arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Neilson Barnard/NBCUniversal/NBCU Photo Bank via Getty Images)
Zoe Kravitz arrives for the 75th Golden Globe Awards on January 7, 2018, in Beverly Hills, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Zoe Kravitz arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Neilson Barnard/NBCUniversal/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actor Zoe Kravitz, earring detail, attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by George Pimentel/WireImage)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Laura Dern arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Neilson Barnard/NBCUniversal/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: 75th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: Actor Laura Dern arrives to the 75th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2018. (Photo by Kevork Djansezian/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Alexander Skarsgaard attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actor Alexander Skarsgard attends The 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
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