There's trouble in paradise for Eva Mendes and her baby-daddy Ryan Gosling. A new report from Star Magazine (cited by InTouch Weekly) is claiming that the "Hitch" actress is worried that her hubby is cheating on her with his "La La Land" co-star Emma Stone.

The 41-year-old actress has reportedly lost all trust in Gosling, who is sharing the big screen with Stone, who will be playing on-screen lover. The two also starred as lovers in the films "Crazy, Stupid, Love" and "Gangster Squad." 

Gosling gushed about his close friendship and chemistry with Stone and previously called Stone his "work wife" and Mendes is allegedly suspicious of their relationship. 

InTouch Weekly cited the report from Star magazine, which claimed that Mendes is "extremely concerned" that the "Notebook" actor and "The Help" star are doing more than just working together.

"It doesn't matter how many times Ryan tells Eva that he and Emma are just friends, she knows there's an attraction there," a source reportedly told Star Magazine. "Eva stops by the set and constantly calls Ryan to see what he's up to. If she gets his voicemail, she'll text and text until he gets back to her. The trust just isn't there, and she thinks it's time they went their separate ways."

Mendes' worries could reportedly stem from Gosling's tendency to date his co-stars. The actor had a lengthy relationship with his "Notebook" co-star Rachel McAdams and he and Mendes reportedly began dating while filming "The Place Beyond the Pines."

If Mendes does find proof that Gosling had been cheating, the mother-of-one is ready to end her relationship with the actor and take full custody of their one-year-old daughter, Esmeralda.

"It's typical Eva - she has to be in control. They're still living together, but already she's trying to organize her future as a single mother," a source told OK! Magazine. "Family and friends are telling her she's not thinking straight, that she's pushing Ryan away. But she's got blinders on."

An insider told OK! Magazine that Mendes main priority is her daughter. 

"Eva wants to know what her options are, should she decide to end her relationship with Ryan," the source said. "She's consulted a lawyer about gaining primary custody of their baby girl, since Ryan's always working. Eva doesn't want a custody battle, but she knows Ryan won't give Esmeralda up without a fight - so she wants to be prepared."

Stone was dating Andrew Garfield, but the couple called it quits after more than a three-year relationship that began on the set of the first "Amazing Spider-Man" movie, according to Us Weekly.

Stone "ended things and moved back to L.A." after Garfield began to dramatically change due to his dedication for his role in the new Martin Scorsese film, "Silence."