EXCLUSIVE

Shelly Sterling will meet with former Microsoft CEO Steve Ballmer Sunday afternoon ... and the subject of the meeting is selling the Clippers ... TMZ Sports has learned.

The meeting will take place at Shelly's Malibu mansion. TMZ Sports broke the story ... Donald Sterling has surrendered control of the team to Shelly.

We're told Shelly sees the handwriting on the wall -- the NBA wants the team sold -- but she wants to do it on her terms. She and her lawyer, Pierce O'Donnell, have been secretly meeting with NBA Commissioner Adam Silver to see if they can reach an agreement whereby Shelly has the right to voluntarily sell the team.

Shelly is taking matters into her own hands. Ballmer -- worth an estimated $20 billion -- has indicated he wants to buy the team. We're told O'Donnell will be present at the meeting.