Pink was photographed frolicking with Juliette and the Licks guitarist Todd Morse over the weekend.
The 'Stupid Girls' singer - who recently announced she and husband Carey Hart were splitting up - wore a tiny red and white spotted bikini and matching hat as she playfully splashed Morse in the Malibu surf in California.
Pink confirmed she had split from motocross rider Hart in February after 21 months of marriage.
The pair denied rumours Hart had cheated on the 28-year-old singer, and released a statement insisting: "This decision was made by best friends with a huge amount of love and respect for one another.
While the marriage is over, their friendship has never been stronger." Since splitting from Hart, Pink has been making the most of being single. She was recently spotted getting close to record producer Butch Walker in a Los Angeles nightclub.
Pink also sparked rumours she is bisexual, after she was seen kissing a mystery woman at Santa Monica's Viceroy Hotel earlier this year.
A source said: "She was flirting the way you'd expect her to flirt with a man, cuddling and being overly affectionate. They were making out."