George Clooney's ER Costar Julianna Margulies Emailed Him Before His Broadway Debut: 'I'm So Proud of You' (Exclusive)

Julianna Margulies has nothing but support for George Clooney ahead of his Broadway debut.

On Wednesday, Oct. 23, PEOPLE spoke exclusively with Margulies, 58, at the Broadway premiere Left on Tenthher new play starring Peter Gallagher.

While at the event, held at the James Earl Jones Theater in New York, A good woman the actress discussed how she and her ex are ambulance costar, 63, are both on Broadway. Although Marguiles has already starred on Broadway, the upcoming stage production of the film Good night and good luck will mark Clooney’s first time on the Great White Way.

Julianna Margulies at the opening night of “Left on Tenth” on Broadway.

Kristina Bumphrey/Variety via Getty

“No, I just gave him a lot of praise,” Margulies tells PEOPLE when asked if she had any advice for Clooney, who will take the stage in spring 2025. “I just emailed him and said, ‘I’m so proud of you. You don’t have to do that.’ ”

According to Margulies, theater can be more challenging than television acting in many ways.

Julianna Margulies says she ‘wrote’ George Clooney a 60th birthday note ‘on the last day of his 50s’

“It’s scary, you know, to be on Broadway. And in the world we live in now, everyone is the judge, and you have to block it all out and do your job,” she tells PEOPLE. “And so, I’m really proud of him because he chose the difficult path. It’s not an easy job and I’m really impressed that he’s doing it.

Margulies and Clooney have remained close friends since starring on the medical drama, which debuted in 1994 and ran for 15 seasons before ending in 2009.

George Clooney and Julianna Margulies, ER. Paul Drinkwater/NBC/Getty

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In the series, she played head nurse Carol Hathaway, while he played her lover, Dr. Doug Ross.

While celebrating the show’s 30th anniversary in September, Margulies told the Television Academy that they still refer to each other by their character names.

Julianna Margulies admits she and George Clooney were ‘in love’ with each other during ‘Emergency’

“It always had to be Carol and Doug in the end,” she said. “George and I, to this day, still sign our personal emails to each other ‘Love, Carol’ or ‘Doug.’ ”

Margulies’ Broadway show is Delia Ephron’s romantic comedy based on her bestselling memoir of the same name.

George Clooney, September 2024.

Daniele Venturelli/WireImage

Meanwhile, Clooney will make his Broadway debut in Good night and good luck — a play based on the 2005 film he co-wrote, directed and starred in.

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“A work of historical drama, Good night and good luck it centers on the conflict between the famous journalist Murrow and the infamous US Senator Joseph McCarthy, the anti-communist HUAC. The title comes from Murrow’s broadcast application. Clooney played Murrow’s co-producer, Fred W. Friendly, on screen,” reads the official synopsis.

“I am honored to be returning to the stage after all these years, and especially to Broadway, an art form and a place that every actor aspires to,” Clooney said after the show was announced in May.

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Source: HIS Education