Josh Hartnettand his wifeTamsin Egertonstunned in cool colors on theOppenheimerred carpet.

The couple was photographed arm-in-arm at the film’s premiere in London with Harnett wearing gray and Egerton opting for teal, as they posed against the fiery red backdrop of the event.

TheOppenheimeractor, 44, wore a sleek gray suit — with the suit jacket left open to reveal a silver shirt buttoned down halfway. He accessorized the look with a matching silver watch on his left arm, which was visible in one shot where he posed while holding his jacket lapel.

Meanwhile, Egerton, 34, wore a teal long sleeved collared dress with pink and white flower motifs, along with metallic strappy heels and silver jewelry as she smiled at the camera while posing for several shots with her husband.

Josh Hartnett attends the UK Premiere of “Oppenheimer” at Odeon Luxe Leicester Square on July 13, 2023

Hartnett and Egerton —  who is known for her appearances onDriving Lessons,St. Trinian’sandCamelot— are extremely private when it comes to their personal lives; they even managed to keep thebirth of their third childout of the press for over a year.

Josh Hartnett and Tamsin Egerton pose for event.Chris Jackson - WPA Pool/Getty Images

Who Is Josh Hartnett’s Wife? All About Tamsin Egerton

Chris Jackson - WPA Pool/Getty Images

After meeting on the set ofThe Lovers, the pair began dating in 2012. Nearly 10 years later,Hartnett and Egerton secretly wedin November of 2021.

The couple welcomed their first child, a daughter, in late 2015. They then welcomed two more children in 2017 and 2019, respectively, though the names of their children have never been revealed.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

John Phillips/Getty

amsin Egerton and Josh Hartnett attend the “Oppenheimer” UK Premiere at the Odeon Luxe Leicester Square on July 13, 2023 in London

Back in April 2016, thePearl Harboractor shared how becoming a dad changed his outlook on life, saying during an appearance onLive! with Kelly and Michaelthat his then-infant daughter is the “apple of my eye” and “perfect in every way.”

“It puts things in a totally new perspective, of course,” the Penny Dreadful alum said at the time. “Your ego just melts away when you have a new kid — your heart leaves your body, and you give it permission to walk around with someone else for a while.”

Oppenheimeris in theaters July 21, 2023.

source: people.com