Lindsay Lohan’s odd behavior in the weeks since her release from a four-week stint in jail and rehab — including clipping a baby stroller with her Maserati and failing two court-ordered drug tests — has spywitnesses close to the former “Mean Girl” concerned that the star may suffer from Multiple Personality Disorder.

In a turn of events so bizarre that it has all the trappings of a bad Hollywood B-Movie (I Know Who Killed Me, anyone?), snitches in Lohan’s Camp believe the troubled actress has “alter egos” that have kept her career on the skids and are preventing her from keeping her nose clean — literally.

The Chicago Sun-Times writes: “‘Some of us had wondered if Lindsay was bipolar, given her mood swings, but I’m thinking it’s more than that,’ said the source, who claims LiLo has on occasion called herself ‘Diane’ or ”Margot.’ According to the insider, Lohan has explained the odd behavior as her way of ‘getting into and out of character’ as an actress — ‘pretending to be other people.’ Supposedly, friends have urged Lohan to seek professional counseling for this issue, but to no avail…”