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?