Johnny Manziel At Pool Party -- NFL Star Gets WET & WILD With Hot Chick [VIDEO]

Johnny Manziel continued to crush it this weekend ... partying his face off at a pool party in Austin with a smokin' hot chick ... who appeared to be clingin' to the NFL star for dear life.

TMZ Sports has footage from Rio Austin -- a rooftop pool, restaurant and lounge -- where the Cleveland Browns QB kicked it before attending the NBA finals game in San Antonio on Sunday.

Sources at the party tell us Johnny was having a blast -- and just by looking at the pics, you can see why.

Love this guy.