LOS ANGELES, California (X17online) - The daughter of billionaire Yahoo! head Terry Semel, Courtenay Semel has entered rehab, X17online has confirmed.

"She's checked into rehab. Her family gave her one last gift and she decided to accept it and change her life," a friend told PageSix.

Semel told The Post recently her father had cut her off after she got arrested at Caesars in Las Vegas for hitting a security guard.

James Vituscka, a spokesperson for Semel, confirmed the stay in rehab.

"Courtenay has indeed checked into rehab . . . She's emotionally, physically and mentally exhausted. She is now taking responsibility for her actions and is excited for her chance to start over," he said.