Serial celebrity dater John Mayer has stuck again, this time the thirty year old womanizer and his guitar have set their sights on twenty-two year old drunk driver Mischa Barton.

John and Mischa spent the night playfully flirting with one another during Hollywood manager Benny Medina’s recent birthday bash on the Sunset Strip, spies tell In Touch Weekly.

“John was flirting with Mischa big time and she seemed to be enjoying it,” a spywitness tells the tab. “I heard her say, ‘John is really so much cuter in person.’”

“I gave him my number,” Mischa was later heard gushing to BFF Nicole Richie.