Britney Spears' first trip alone with her two sons since ex-husband Kevin Federline gained sole custody took an unexpected turn when 2-year-old Jayden was rushed to a hospital near the pop star's Brentwood, Louisiana home on Sunday.

Monday afternoon, this statement was posted on Spears' official site: "Jayden James Federline was admitted to the Southwest Mississippi Regional Medical Center on Sunday, November 9th. Doctors concluded he had a reaction to something he ingested. He is expected to be discharged tomorrow."

Sources are telling People.com that Jayden is now "doing fine" after suffering a "terrible allergic reaction. He had hives, was itchy and irritable," the cause of which was apparently still not known, according to the source.

Kevin Federline's whereabouts during the incident are unknown, and he has yet to comment on the matter.

Click here for the full report on People.com.