Appendix Surgery for Lindsay Lohan
updated 01/05/2007 AT 07:40 AM EST
•originally published 01/04/2007 AT 03:25 PM EST
"She does have appendicitis, and she is getting her appendix removed," her rep, Leslie Sloane, told PEOPLE Thursday afternoon. "She will be going in shortly."
The 20-year-old actress was reportedly diagnosed after feeling ill on Wednesday.
"I'm shocked," a friend of the actress tells PEOPLE. "I talked to her last night and she told me she was not feeling well but she thought it was a 24-hour-flu."
This is not the first health scare for Lohan. She fractured her wrist in September after a fall at a party in New York City, and was hospitalized in July after becoming "overheated and dehydrated," Sloane said at the time.