Lindsay Lohan Visits a Friend in L.A. Hospital

05/30/2008 at 05:25 PM EDT

Lindsay Lohan and Samantha Ronson made a trip to the emergency room Thursday night – but not to be treated, her rep tells PEOPLE.

"Lindsay went to the hospital to visit a friend," says her rep. "She is in rehearsal today for her film Labor Pains."

Lohan and Ronson were spotted at Century City Hospital in Los Angeles on Thursday evening

Later, Lohan briefly accompanied Ronson to her deejaying gig at West Hollywood's Goa.

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