Lindsay Lohan Is Engaged!!!

From Russia with love -- Lindsay Lohan is engaged to be married to her 22-year-old boyfriend.

We're told Russian heir Egor Tarabasov popped the question over the weekend, and LiLo said ... Da.

As we've told you ... 29-year-old Lindsay and Egor started dating about 5 months ago, and got serious pretty quickly. Egor spent the holidays in NY with the Lohan fam, who gave him the stamp of approval.

Egor, whose father is a multi-millionaire businessman, met Linds through mutual friends at a party.