NBA's Chandler Parsons -- Dating Leo DiCaprio's Ex ... Smokin' Hot Model

Major props to Dallas Mavericks star Chandler Parsons ... who seems to be on a PDA level with his apparent new girlfriend Toni Garrn -- a super hot model who once dated Leo DiCaprio.

The couple was spotted out in NYC on Wednesday -- holding hands and kissing as they walked along the street.

No word on how long the two have been dating or how serious they are ... but they look great together.

FYI -- Garrn is a 22-year-old German model who's worked for Victoria's Secret and Calvin Klein. She started dating DiCaprio back in 2013 ... but they broke things off back in December.