Lindsay Lohan's alleged nightclub assault -- and her weekend-long partying -- will not scare off the producers who hired her to play Elizabeth Taylor.

Lindsay's rep Steve Honig tells TMZ he spoke to the filmmakers this morning -- after the photos of LiLo at the Coachella Music Festival came out -- and says, "Producers have assured us everything is on track and there are absolutely no problems."

Sources close to the production tell us producers also aren't overly concerned about the ongoing police investigation into whether Lindsay assaulted a woman at a Hollywood nightclub. We're told they're sticking with Linds ... for now.

Honig says, "Lindsay is going to star in Liz and Dick."