Sterling K. Brown officially joins 'Marvelous Mrs. Maisel' following Rachel Brosnahan's request

It's official... Sterling K. Brown is joining another popular TV series!

The This Is Us star announced in an Instagram video on Monday that he will play a role in season three of Amazon's The Marvelous Mrs. Maisel.

"I'm Eastward bound. I'm going to do a little TV show. Maybe you've heard of it? The Marvelous Mrs. Maisel," he exclaimed. "The Palladinos were kind enough to write a little something for your boy and I said yes. So, stay tuned. I'm getting together with Midge and it's going to be awesome."

"I'm beyond excited to share some pretty marvelous news," he added in the caption. "#MrsMaisel, I'm coming for you!"

The show's star, Rachel Brosnahan, told ET last month at PaleyFest that Brown, who was her ultimate dream guest, was "in negotiations" to join the cast for the upcoming third season. What type of role did she think he could play?

"I feel like I'm not allowed to have any opinions about the show," she replied. "Our writers are good here, and they would come up with something brilliant, I'm sure."

Creator Amy Sherman-Palladino also weighed in on having Brown join the cast, telling ET, "[Brosnahan] doesn't have to campaign very hard. We all want Sterling K. Brown on the show."

"We're massive fans, and we just love him to death, so we would be thrilled," she added. "Thrilled, thrilled, thrilled."

After Brosnahan initially pitched the idea to ET at the SAG Awards in January to have Brown join her show, the 43-year-old actor told us he'd totally be down for it.

"I would go crazy," he said at the time. "I'm in, I'm in."

"The show is done at such an incredibly high level," he continued. "It's so funny, and it's so full of heart. It's so specific. Like, I love the specificity of the world, and I would love to step in that. The Palladinos are so clear in what they're doing. You know, that's the type of people you want to work with."

Hear more in the video below.

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Sterling K. Brown out and about
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Sterling K. Brown out and about

Sterling K. Brown joined Clorox and Thrive Collective to celebrate the transformative power of clean at a new Youth Opportunity Hub in Harlem, New York.

(Credit: Diane Bondareff / Invision for Clorox / AP Images)

MINNEAPOLIS, MN - FEBRUARY 03: Sterling K. Brown attends the NFL Honors at University of Minnesota on February 3, 2018 in Minneapolis, Minnesota. (Photo by Jeff Kravitz/FilmMagic)
HOLLYWOOD, CA - JANUARY 29: Ryan Michelle Bathe, Sterling K. Brown and son Andrew Brown attend the Premiere Of Disney And Marvel's 'Black Panther' - Arrivals on January 29, 2018 in Hollywood, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
THIS IS US -- 'Vegas, Baby' Episode 216 -- Pictured: Sterling K. Brown as Randall -- (Photo by: Ron Batzdorff/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - JANUARY 21: Actors Ryan Michelle Bathe and Sterling K. Brown attend the 24th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 21, 2018 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
Sterling K. Brown accepts the Outstanding Performance by a Male Actor in a Drama Series award for 'This Is Us' onstage during the 24th Annual Screen Actors Guild Awards show at The Shrine Auditorium on January 21, 2018 in Los Angeles, California. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
LOS ANGELES, CA - JANUARY 20: Sterling K. Brown attends the Entertainment Weekly hosts celebration honoring nominees for The Screen Actors Guild Awards held on January 20, 2018 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
LOS ANGELES, CA - JANUARY 20: Sterling K. Brown (L) and Ryan Michelle Bathe attend Entertainment Weekly's Screen Actors Guild Award Nominees Celebration sponsored by Maybelline New York at Chateau Marmont on January 20, 2018 in Los Angeles, California. (Photo by Donato Sardella/Getty Images)
THIS IS US -- 'Vegas, Baby' Episode 216 -- Pictured: (l-r) Sterling K. Brown as Randall, Justin Hartley as Kevin -- (Photo by: Ron Batzdorff/NBC/NBCU Photo Bank via Getty Images)
PASADENA, CA - JANUARY 15: Sterling K. Brown speaks onstage at the 49th NAACP Image Awards on January 15, 2018 in Pasadena, California. (Photo by Earl Gibson III/WireImage)
SANTA MONICA, CA - JANUARY 11: Sterling K. Brown and Ryan Michelle Bathe attend The 23rd Annual Critics' Choice Awards - Arrivals at The Barker Hanger on January 11, 2018 in Santa Monica, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Sterling K. Brown and Ryan Michelle Bathe attend the 75th Annual Golden Globe Awards - Arrivals at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
BEVERLY HILLS, CA - JANUARY 07: Actor Sterling K. Brown holds his award for Best Performance by an Actor In A Television Series Drama in 'This Is Us' in the press room during the 75th Annual Golden Globe Awards at The Beverly Hilton Hotel on January 7, 2018 in Beverly Hills, California. (Photo by George Pimentel/WireImage)
LOS ANGELES, CA - JANUARY 05: Sterling K. Brown attends the 18th Annual AFI Awards at Four Seasons Hotel Los Angeles at Beverly Hills on January 5, 2018 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
NEW YORK, NY - DECEMBER 17: Sterling K. Brown attends CNN Heroes 2017 at the American Museum of Natural History on December 17, 2017 in New York City. 27437_015 (Photo by Kevin Mazur/Getty Images for CNN)
Actor Sterling K. Brown attends The Hollywood Reporter 2017 Women In Entertainment Breakfast, on December 6, 2017, in Hollywood, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
THIS IS US -- 'Clooney' Episode 212 -- Pictured: Sterling K. Brown as Randall -- (Photo by: Ron Batzdorff/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - OCTOBER 08: Susan Kelechi Watson and Sterling K. Brown arrive at The Rape Foundation's Annual Brunch at a private residence on October 8, 2017 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
WATCH WHAT HAPPENS LIVE WITH ANDY COHEN -- Pictured (l-r): Sean Hayes and Sterling K. Brown -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
NEW YORK - SEPTEMBER 25: The Late Show with Stephen Colbert and guest Sterling K Brown during Monday's September 25, 2017 show. (Photo by Scott Kowalchyk/CBS via Getty Images)
TODAY -- Pictured: Hoda Kotb, Savannah Guthrie and Sterling K. Brown on Monday, September 25, 2017 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - SEPTEMBER 23: Actor Sterling K. Brown attends the 21st Annual Urbanworld Film Festival at AMC Empire 25 theater on September 23, 2017 in New York City. (Photo by Ray Tamarra/Getty Images)
LOS ANGELES, CA - SEPTEMBER 17: Ryan Michelle Bath (L)and actor Sterling K. Brown, winnerof the award for Outstanding Lead Actor in a Drama Series for 'This is Us', attend the 69th Annual Primetime Emmy Awards Governors Ball on September 17, 2017 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
LOS ANGELES, CA - SEPTEMBER 17: Actor Sterling K. Brown poses in the press room at the 69th annual Primetime Emmy Awards at Microsoft Theater on September 17, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
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