By Jen Heger

Breaking Celebrity News Legal Editor

Lindsay Lohan completed her first day of court-ordered community service at the Downtown Women's Center, and she's apparently taking the gig seriously.

A source tells Breaking Celebrity News Lindsay was "very professional" and at times moved by the homeless women she met at the Los Angeles shelter.

"Staffers didn't know what to expect, but Lindsay showed up and was thoroughly engaged during the day," an insider close to the situation tells us.

Lindsay was ordered to perform a staggering 380 hours of community service last month for violating terms of her probation for a 2007 DUI conviction.

"Lindsay was truly humbled," the source added. "Staffers had her sort through donations and talk to the clients. Lindsay was especially moved by the children of these homeless women."

Not everybody who's ordered to help out as part of a sentence, however, is as helpful as Lohan.