Who is Lindsay’s friend Samantha Ronson?

LOS ANGELES - She’s the woman who Lindsay Lohan was caught partying with, reportedly screaming profanities at, and partying with again over Memorial Day weekend, but who exactly is Samantha Ronson?

Heavily entrenched in the music world, 29-year-old Ronson is primarily known for being a celebrity DJ a la Nicole Richie’s ex, DJ AM.

Ronson has been spinning at a host of exclusive parties for years. Some of the most notable, according to her own Web site include Jessica Simpson’s birthday party and corporate events for Blender, Maxim, PlayStation and ElleGirl. She also DJ’d alongside Lohan at the American Music Awards one year, but Ronson’s history with the star goes back much further.

As a singer-songwriter, Ronson’s Ashlee Simpson-esque single “Built This Way,” was featured on the 2004 soundtrack for “Mean Girls.” She appears to have been friends with Lohan for years, recently featuring in an article in Nylon magazine where she reportedly helped search for Lohan gossip on the web and read it to the starlet.

Ronson comes from a musical family. Her brother Mark Ronson is also a world-traveling DJ who just released an artist album where he produced such stars as Amy Winehouse and Lily Allen. Their stepfather is Foreigner’s Mick Jones.

MORE FROM ACCESS HOLLYWOOD

Access Hollywood Section Front

Murphy’s husband ‘destroyed’ by her death Tila Tequila to be surrogate mom for brother Gisele Bundchen reveals name of her new baby Jake and Reese reportedly split Kourtney Kardashian welcomes baby boy Kendra Wilkinson gives birth to baby boy 10 most expensive movies ever made Underwood says song isn’t about Tony Romo Amanda Peet expecting baby No. 2 Kate Gosselin spotted filming new series Access Hollywood Section Front