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  (Photo: Reuters/ Brendan McDermid)
  Actor Ashton Kutcher

Mila Kunis is reportedly having trust issues with her boyfriend Ashton Kutcher as new reports suggest that the actress is paranoid that he could potentially cheat on her.

The former "That '70s Show" co-stars have reportedly been dating for at least six months and Kunis, 29, recently felt compelled to set ground rules for their relationship after learning that Kutcher, 34, would be working with engaged actress Miley Cyrus, 19, on the CBS sitcom "Two and a Half Men."

"[Kunis is] taking precautions by setting some ground rules for her philandering beau," such as forbidding any "extracurricular partying or socializing with Miley" [and demanding] "no flirty texts or emails back and forth," a source reportedly told Star magazine.

"She's concerned that with Ashton's checkered cheating history, he could easily fall prey to Miley's charms," the source went on.

Kutcher's estranged wife, Demi Moore, announced that she was filing for divorce after six years of marriage following reports of an alleged cheating scandal involving 22-year-old party girl, Sara Leal. Kutcher allegedly engaged in an extramarital affair with Leal on the night of his and Moore's sixth wedding anniversary.

"It is with great sadness and a heavy heart that I have decided to end my six-year marriage to Ashton. As a woman, a mother and a wife there are certain values and vows that I hold sacred, and it is in this spirit that I have chosen to move forward with my life," Moore said in a statement.

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Kunis, who reportedly dated former child star Macaulay Culkin for more than 10 years prior to dating Kutcher, is now fearful that Kutcher may also cheat on her so she is taking extreme measures in a bid to prevent a cheating scandal.

Kunis warned Kutcher that she will be "making regular drop-in visits to the set to make sure he and Miley are on their best professional behavior," the source said.

The new couple is said to be madly in love and they are allegedly growing more serious each day even though Kutcher's divorce from Moore, 49, is yet to be finalized.

"Ashton and Mila are totally together and loving it. He always had a thing for her and he finally made it happen . . . It is real infatuation right now," a source close to the pair reportedly told Us Magazine.