Play video content EXCLUSIVE

Oscar De La Hoya has proclaimed himself single -- which apparently means his longtime marriage to pop singer Millie Corretjer is down for the count.

Oscar made the announcement while partying at 1 OAK nightclub on the Sunset Strip this week ... saying, "Guess what ... I'm single!"

Oscar and Millie married in 2001. They have 2 children together.

We contacted Oscar's rep, Stefan Friedman, for comment and he gave us the following statement:

"Oscar's personal life is just that -- personal."