Chris Brown Under Investigation by Child Protective Services Following Gun Assault Arrest

Plus, star was denied permission to enter Japan for his show because of ongoing case

The legal ramifications stemming from Chris Brown's latest woe are far from over.

E! News has learned that child protective services have launched an investigation targeting the star following his highly publicized gun assault arrest late last month.

A source closed to the Los Angeles County Department of Children and Family Services tells NBC News that they paid a visit to Brown's home today to check on his 2-year-old daughter Royalty, who is said to be staying with him right now.

TMZ, who first reported the story, claims Royalty's mother, Nia Guzman, seems to be the one who filed the complaint against Breezy after Baylee Curran claimed Brown pulled a gun on her.

At the time of the incident, E! News learned that Royalty's custody may be in question. Brown's attorney also told E! News that no guns or drugs were found at the home and Royalty was not present at the time of the incident.

Legal expert Troy Slaten told us at the time that this case "will almost certainly be the basis for additional proceedings in family court over the status of Royalty," and explains that Guzman could fight for sole custody as well as more child support.

Slaten also believes that Guzman will use Brown's recent legal troubles as a basis to petition the court to grant her sole physical custody. She also might request that any visitation Brown receives be monitored. "I expect to see movement on the family law case immediately," Slaten shares with us. "Guzman can file an emergency petition to have the court act 'in the best interests of the child.'"

In addition to the investigation, Brown's gun assault arrest has prevented him from entering Japan.

E! News has confirmed that the singer was scheduled to perform in Tokyo next week, but was denied permission to enter the country via working visa because of the ongoing investigation.

A Japanese consulate official tells TMZ, who first reported the story, that the country has a very low tolerance for admitting visitors with criminal backgrounds and open cases.

Brown and his legal team plan to reapply before his Japan tour dates.

—Reporting by Lindsay Good