According to people.com:
Shauna Sexton relaxed in a dark bikini on the beach in Malibu — just hours before her rumored beau Ben Affleck checked into rehab.
On Wednesday, Sexton, 22, showed off her abs and wore a simple necklace for her sandy outing.
The Playboy model and Affleck, 46, were photographed in recent days amid news that he and Lindsay Shookus, 38, had called it quits after one year of dating.
The two shared dinner together at Nobu restaurant in Malibu were later photographed grabbing Jack In The Box in Santa Monica over the weekend.