Lindsay Lohan vs Rosie O'Donnell

Sources close to LiLo tell TMZ, there was never any bad blood between the two actresses -- in fact, Lindsay and Rosie were always on great terms ... Lindsay would even say hello to Rosie whenever she saw her at various events. Rosie was always nice to her.

According to sources, Lindsay always had a special fondness for Rosie -- because one of Lindsay's first ever talk show appearances was on Rosie's old show back in 1998 ... when a 12-year-old Lindsay was promoting "The Parent Trap."

But even though she's surprised ... Lindsay isn't upset -- because Rosie's not the only person who doubts Lindsay's comeback ... starting with her upcoming Liz Taylor role.