AceShowbiz -

Uh oh, does Jennifer Lopez have a suspicion about her beau Alex Rodriguez cheating on her? Rumor has it, the "Ain't Your Mama" songstress has hired a private investigator to follow her boyfriend in fears that he would be back to his "player" self.

Alex previously sparked cheating rumors when he was said to be cheating on his ex-wife Cynthia Scurtis following their split in 2008. He was allegedly romancing Madonna behind Cynthia. A source has now told National Enquirer that J-Lo "is well aware Alex cheated" at that time, which leads to speculation that she has hired a detective to spy on him.

The alleged source further claims that J-Lo is worried about Alex's reputation for being a "player" and that she "doesn't want to be another notch in A-Rod's belt." The source even believes that the "Shades of Blue" actress has reached out to Alex's ex-wife and ex-girlfriends like Kate Hudson and Cameron Diaz to consult them on whether she should stay with him or not.

Despite the rumors, their relationship seems to be getting serious as they have reportedly been talking about marriage although they have only been dating for three months. It's said that J-Lo would even say yes if Alex asked her to marry him.

J-Lo's previous marriages didn't last long. She was married to Cuban waiter Ojani Noa from 1997 to 1998, and to backup dancer Cris Judd from 2002 to 2003. Her marriage to singer Marc Anthony, however, lasted more than seven years.