Selena Gomez has undergone a number of tests for blood pressure issues, since being hospitalized on Thursday.
Gomez was rushed to the hospital on Thursday after taping an appearance on The Tonight Show, when she was complaining of nausea and a severe headache. She was released on Friday, but re-entered on Saturday.
Sources say the 18-year-old star of Disney's Wizards of Waverly Place has undergone a number of tests for blood pressure issues, but so far - doctors haven't been able to determine what's causing the problem.
Gomez is scheduled to perform at Santa Monica Place on Monday, and to co-host the 2011 Much Music Video Awards, on Sunday June 19th. It is unknown if these appearances will be cancelled due to Gomez's health issues.
Oh, and she's not pregnant.