Peter Sarsgaard Spills on Playing Robert Kennedy

Peter Sarsgaard and Maggie Gyllenhaal are, in fact, the real thing.

And after more than 14 years of marriage, the Memory actor chalks up his long-lasting relationship with the actress to one basic rule.

"Tell the truth," Peter told E! News' Francesca Amiker in an exclusive interview. "Isn't that all there is? It's pretty simple. It's not that complicatedคำพูดจาก สล็อตเว็บตรงฝาก. Isn't that the secret to any friendship or relationship?"

For Peter—who shares kids Ramona, 17, and Gloria, 11, with Maggie—honesty is, indeed, always the best policy.

"Otherwise, even if it's a nice lie, even if it's a lie to prop someone up or help them avoid what they're trying to avoid, you're not living in reality," he continued. "And that's the only place to live in."

And these days, they're living in—and relishing—the holidays and their annual traditions.

"There's a church that we go to that has a midnight mass that I don't go to any other time throughout the year," the 52-year-old, a close friend of Maggie's brother Jake Gyllenhaal, explained. "The midnight mass there is extraordinary, and Maggie and I are sometimes able to sing."

photosFashion Spotlight: Maggie Gyllenhaal

As for the ultimate present he thinks you can give to someone? Much like his character opposite Jessica Chastain in Memory, it involves allowing another person to simply be themselves.

Kevin Mazur/WireImage

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"Being a mirror, just reflecting what you see accurately," he noted. "That's the greatest gift you can give anyone. A partner, a friend, anything."

Memory hits theaters Dec. 22 in New York and Los Angeles, followed by a nationwide release Janคำพูดจาก เป๋าเงินจริงสำ. 5.

Until then, to see how more of your favorite stars are getting into the holiday spirit, keep reading…

photosView More Photos From Holidays 2023: Celebs Celebrate Christmas, Hanukkah and MoreWatch E! News weeknights Monday through Thursday at 11 p.m., only on E!.