Scott Disick and New GF 18 Fits Me Just Fine

10/3/2015 7:43 AM PDT

Scott Disick and New GF -- 18 Fits Me Just Fine (PHOTOS)

Scott Disick took his new girlfriend across state lines ... from New York to Florida.

Scott and 18-year-old Lindsay Vrckovnik were having fun in the sun in Miami Friday, showing skin, nuzzling and soaking in the sights.  Lindsay's got some nasty bruises on her legs.

They spent a day or so in NYC the day before, where Scott showed Lindsay around.

Kourtney who?