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Tom Sturridge, Sienna Miller, Vanity Fair Oscar Party

Pascal Le Segretain/Getty Images

It looks like it's over between Sienna Miller and Tom Sturridge.

According to The Sun (via The Mirror), the couple has ended their three-year engagement. Together since 2011, Sienna, 33, and Tom, 29, are parents to daughter Marlowe Sturridge, 3. The breakup reportedly happened "a few weeks ago," and they are said to be on good terms post-split.

E! News' calls to the actors' reps went unreturned.

Sienna, Tom and Marlowe were most recently seen on vacation in Ibiza two weeks ago. A Sun source said the American Sniper actress and Robert Pattinson's BFF "still love and respect each other as friends and parents," adding, "It's a very amicable breakup and they intend to remain great friends."

"It was just a case of them being honest with each other and putting first the fact they are parents," a source told The Sun, which broke the breakup news.

However, E! News has learned that Sienna and Tom had been fighting a lot recently. "It seemed like it was only a matter of time," an insider explains.

Tensions weren't always so high. As Sienna gushed to Vogue last year, Tom is a "grounded, intelligent, kind and intact person. There's no drama." Sienna added that she and Tom have helped each other in other ways, too. "As much as he helps my work, I help him. We're both completely supportive of that need for creative output," the Foxcatcher actress told the magazine. "At the moment, we're just both trying to blast it, to get to a really great place."

Sienna and Tom announced their engagement in 2012, and Marlowe was born six months later. Given the stars' compatibility, could there be hope for a romantic reconciliation? After all, Miller broke off her engagement to Jude Law in 2006 only to reunite with her Alfie co-star three years later. (However, they split for good in 2009.) Time will tell if Sienna and Tom are meant to be.

—Reporting by Baker Machado