We got the reality TV OG -- as she describes herself -- and her fiance, Chris Zylka, Thursday at LAX -- and asked if she had any advice for Linds as she shoots her reality show, "Lohan Beach Club."
The couple laughed it off in unison, although Chris did have one very harsh tip for Lohan.
Old habits die hard ... kinda like that grudge, which Paris says is all about Lindsay crossing her fam.
Far as we can tell, P's referring to her bro, Barron, catching a beatdown at a 2013 party. Lindsay was accused of masterminding the attack