NBA's Chandler Parsons Split from Victoria's Secret Model

Sad news ... NBA star Chandler Parsons and his ex-Victoria's Secret model girlfriend, Toni Garrn, are officially over ... TMZ Sports has learned.

The two had been dating since last summer -- months after she split with Leonardo DiCaprio -- and they seemed to be getting pretty serious as of late.

But a source close to the former couple tells us the two have "amicably split" -- and despite the fact they've scrubbed each other from their Instagram accounts, they're still on good terms.

So, what went wrong? We're told work got in the way. They're both focusing on their careers -- Toni's doing the modeling thing and Chandler's working on getting back on the court with the Memphis Grizzlies after knee surgery back in March.

Don't worry, he's a rich NBA star (signed a $94 MILLION contract back in July) and she's a super hot model -- they'll be fine.