The DJ, 32, arrived at Century Regional Detention Facility in Lynwood, Calif., around 1:40 p.m. on Thursday and stayed about an hour. While leaving the all-women's jail, Ronson snapped at a reporter who asked how Lohan, 24, was holding up.
"How do you think she's doing?" Ronson replied.
Later, on her Twitter page, Ronson wrote: "Song Of The Day: Rolling Stones – Waiting on A Friend."
Lohan's attorney, Shawn Chapman Holley, also dropped by and her former attorney Blair Berk visited her earlier in the day. "She's good. She's (doing) better every day," Chapman Holley says.
Though visiting hours at the jail are on the weekend for family and friends, Lohan has been able to see visitors "for security reasons. It's for the safety of everyone," law enforcement officials told local TV station KTLA.
The actress is likely to serve two weeks of a 90-day sentence for violating probation in a DUI case.
Reporting by KEN LEE