EXCLUSIVE

Lil' Kim is 2-faced, according to an artist who claims Kim has jacked the punim she made famous ... and she's going after the rapper in a big way.

Canadian artist Samantha Ravndahl lashed out at Kim on social media websites in November for lifting her scary image off Reddit, then using it on the Lil' Kim website and Instagram accounts to promote her music.

Ultimately, it looks like Kim blew off Samantha, so now the artist has lawyered up and fired off a letter to the rapper demanding Kim pull the image ... or else.

The "or else" is suing Kim for $150K minimum.

And the lawyer's letter points out a Lil' irony. Kim once went on Hot 97 radio and complained Nicki Minaj stole her swag, adding, "If you are going to steal my swag, you gonna have to pay."