Brad Pitt Mingles with Girlfriend Ines de Ramon at Babylon Premiere Afterparty - Yahoo Entertainment

Emma McIntyre/WireImage

Brad Pitt had his woman Ines de Ramon by his broadside Thursday night, astatine the Los Angeles premiere of his caller movie Babylon.

The Oscar-winning actor, 58, was seen with the jewelry executive, 32, astatine the afterparty for the caller movie — the 2 mingling with guests, occasionally with their arms astir each other.

Their outing comes a period aft PEOPLE confirmed the brace "have been dating for a fewer months." They were archetypal photographed unneurotic connected Nov. 13, alongside Cindy Crawford and Rande Gerber, backstage astatine a Bono concert astatine Los Angeles' Orpheum Theatre.

According to the source, "Brad is truly into" de Ramon, who separated from her husband, Vampire Diaries star Paul Wesley, earlier this year. "They met done a communal friend. She is precise nice," the insider added.

"Ines is cute, amusive and energetic. She has a large personality," a 2nd insider said, noting the 2 aren't yet exclusive. "Brad enjoys spending clip with her."

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Kurt Krieger/Corbis via Getty; Alberto E. Rodriguez/Getty Brad Pitt; Ines de Ramon

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Babylon follows Pitt arsenic fictional movie prima Jack Conrad successful 1920s Hollywood, amid a modulation from soundless to dependable films.

The movie is written and directed by Oscar-winner Damien Chazelle.

Speaking to PEOPLE Thursday connected the reddish carpet astatine the Academy Museum of Motion Pictures, Pitt opened up astir the "intense" filming docket of the decadent 1920's comedy-drama, which besides stars Tobey Maguire, Olivia Wilde, Jean Smart, Jeff Garlin, and Pitt's Once Upon a Time... successful Hollywood costar Margot Robbie.

"We person 700 extras, doing a warfare country successful the background. We're trying to drawback it close erstwhile the prima goes down," Pitt said. "That's truly what movie-making feels like. You're losing the light, everyone's racing, jamming, to effort to get this happening conscionable close and we've lone got this model of clip and that's it. It's locked into cement. It's intense."

"So there's a infinitesimal of that successful the movie that's truly beautiful," helium added.

Scott Garfield/Paramount Pictures Brad Pitt and Diego Calva successful Babylon

RELATED: Margot Robbie Says She Improvised Her 'Babylon' Kiss Scene with Brad Pitt: 'So Sue Me'

Pitt besides revealed to PEOPLE wherefore helium believes costar Diego Calva is destined to go Hollywood's adjacent been thing.

"He's conscionable solid. He's conscionable solid. He knows what he's doing," helium said of the 30-year-old. "You cognize helium walked into this movie and he's truly the lead, and past determination are aggregate characters that each transverse paths successful the soundless movie era, but truly each revolves astir him — it's done his eyes, helium carries it."

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Emma McIntyre/WireImage Sarie Kessler and Margot Robbie connected the Babylon reddish carpet

As for Robbie, she shares a buss with Pitt successful the movie — a infinitesimal she improvised.

"I thought, 'When other americium I gonna get the accidental to kiss Brad Pitt? I'm conscionable gonna spell for it,' " she told E! News earlier this month, noting that the country "was conscionable great" arsenic she elaborate however the speech with Chazelle went.

"I said, 'Damien, I deliberation Nellie would conscionable spell up and buss Jack. And Damien was like, 'Well, she could — wait, clasp on. You conscionable wanna kiss Brad Pitt,' " Robbie, 32, recalled. "And I was like, 'Oh, truthful writer me. This accidental mightiness ne'er travel up again.' And helium was like, 'It does enactment for the character,' and I was like, 'I deliberation so.' "

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After 1 take, Chazelle, 37, was persuaded, according to Robbie. "He was like, 'No, bash it again. That truly works.' I was like, 'Oh, great,' " said Robbie.

Babylon hits theaters Dec. 23.