A new report is raising new questions about Lindsay Lohan's drug use.

Despite claims that she's "been eating enough," as Lohan told E! News this week, those that spotted the star on vacation in Hawaii last week say she was nothing but skin and bones.

Lohan admits that her recent, quite public breakup with Samantha Ronson has contributed to "a hard month," but she's consistently rebuked accusations of an eating disorder.

Now, an article in Us Weekly actually agrees with Lindsay that neither anorexia nor bulimia is to blame for her overly svelte figure; instead, the tabloid reports that Lohan takes Adderall, a prescription drug typically given to people for attention deficit hyperactivity disorder.

"She takes Adderall all the time," said a source. "She gets jittery because of the way the pills affect her. It's a major reason why she's losing weight."

You don't need to ingest your finger, Lindsay. Can someone please get this girl some food?!?

[Photos: Splash News]