Tina Fey and Amy Poehler have been friends for 30 years and are going on tour. Here's a timeline of their friendship.

In 1993, both were taking classes at Chicago's improv theater iO, formerly known as ImprovOlympics. The theater's cofounder sensed they'd get along and introduced the two.

In her 2013 memoir "Yes Please," per People, Poehler wrote the cofounder described Fey as like Poehler "but with brown hair"

The two soon started performing together in an improv group called Inside Vladimir. They later both auditioned for Second City on the same day and landed roles with the coveted comedy company.

In 1996, Poehler moved to New York with her sketch group, the Upright Citizens Brigade.

Fey stayed in Chicago and got a job in a main company at the comedy club Second City.

That summer, Poehler returned to Chicago to perform alongside Fey in an iO show.

In 1997, Fey got a job writing for "Saturday Night Live," where she eventually became the show's first head female writer.

She would occasionally perform comedy with Poehler, and even starred in an episode of the "Upright Citizen's Brigade" show.

After years of Fey asking her to join the show, Poehler was hired as a cast member on "SNL."

The duo's first film together was the 2002 comedy "Martin & Orloff."

They also appeared together in the 2004 cult-classic comedy "Mean Girls," where Poehler was Regina George's "cool mom" and Fey was a teacher.

The duo became the first female co-anchors of recurring "SNL" skit, "Weekend Update."

Fey left that desk after the 2006 season, but occasionally returned in sketches as Sarah Palin, often alongside Poehler as Katie Couric or Hillary Clinton.

Poehler and Fey appeared on the cover of the magazine's April 2008 issue. They were interviewed as part of a story about women in comedy.

Although they'd acted together before, "Baby Mama" was the first movie they costarred in. Fey played a businesswoman dealing with infertility and Poehler played her surrogate.

In 2010, Fey won the Kennedy Center Mark Twain Prize for American humor — it was presented to her by Poehler.

While presenting, Poehler called Fey "a dynamite woman, a first-class lady, an upstanding broad and a straight-up dame."

Actually, Fey dedicated an entire chapter of her autobiographical comedy to Poehler. It's called "I Don't Care If You Like It (One in a series of love letters to Amy Poehler)."

Poehler and Fey also hosted the award show in person in 2014 and 2015. They hosted from separate coasts in 2021, when the Globes were semi-virtual.

The two are uncredited, but do appear briefly as anchors of an entertainment-news program. It could be a nod to their former time on the "Weekend Update" desk.

The actor released her memoir "Yes Please" in October 2014. Poehler has a chapter dedicated Fey titled "Partner in Crime." It also includes an acrostic poem dedicated to Fey.

In February, the duo returned to "Weekend Update" as part of an "SNL" 40th-anniversary special. They also cohosted the "SNL" holiday episode in December 2015.

Later that year, "Sisters," the second comedy they costarred in, made its debut.

Poehler made her directorial debut with the comedy "Wine Country," which featured Fey and other "SNL" alums.

In February 2023, they announced their first-ever live comedy tour with plans to stop in DC, Chicago, Boston, and Atlantic City.

"If this tour goes right, we can finally end this friendship," Poehler and Fey joked in a statement, per People.