Robert Pattinson and Kristen Stewart have split up, according to Us Weekly.

OMG, frownie face.

A source close to Pattinson reportedly told Us Weekly the actors have been "having problems" and "fighting a lot," which may refer to a big argument they had May 13 at Pattinson's 27th birthday party.

The source also said the couple -- who starred in the "Twilight" films -- could reconcile. The pair were reportedly being openly affectionate at New York City's Cabin, where they met following Stewart's appearance at the Met Gala.

The two have dated since meeting in 2008 on the set of the first Twilight film. They split last year after news broke of Stewart having a fling last summer with Rupert Sanders, her director in "Snow White and the Huntsman."

Stewart released a public apology, saying "I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected. This momentary indiscretion has jeopardized the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry."

The pair reconciled a few months later and jointly promoted "Breaking Dawn: Part 2" together.

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Kristen Stewart, left, and Robert Pattinson in a scene from "The Twilight Saga: Breaking Dawn Part 2."
Kristen Stewart, left, and Robert Pattinson in a scene from "The Twilight Saga: Breaking Dawn Part 2." ( (AP Photo/Summit Entertainment, Andrew Cooper))