Charlie Sheen Gave Lindsay Lohan $100,000 For Her Tax Bill

Sources close to Lindsay tell us she and Charlie became close pals while on the set of "Scary Movie 5" back in September -- spending a lot of time together both on and off the set.

During their bonding period, we're told Lindsay and Charlie talked about everything -- and at one point, Lindsay mentioned her ongoing tax problems.

We're told Charlie offered to cut her a check then and there to get the IRS off her tail, but Lindsay refused.

Fast forward to last week -- sources close to Lindsay tell TMZ, Lindsay's biz manager received a check from Charlie for $100,000.

We're told Lindsay was blown away by Charlie's generosity -- and immediately applied the money to her outstanding tax bill.