Lindsay Lohan reportedly "threw a fit" when she was refused a backstage pass at Coldplay's concert in Los Angeles on Wednesday (03.08.11).
The 'Mean Girls' star had been given prime seats for the show from the group's frontman Christ Martin but after the gig - which she attended with her sister Ali - she wasn't allowed to hang out with the band.
A source told The Sun newspaper: "When Lindsay was told she wasn't allowed backstage because her pass didn't allow it, she threw a complete fit.
"She protested to the people running the guest list, hoping they'd change their minds but it was still a firm 'no'.
"She got even more angry when she found out fellow actress Kate Bosworth was there mingling with Chris' wife Gwyneth Paltrow and the band.
"In the end she got so fed up, she stormed out."
British actress Kate was at the concert at the UCLA Tennis Center with her new boyfriend Michael Polish, and is said to have been friends with Coldplay - which also includes Jonny Buckland, Guy Berryman and Will Champion - since their early career.
Earlier in the evening, Lindsay - who was recent released from house arrest, served in lieu of jail time for taking a necklace from a boutique and violating the terms of probation set for her 2007 conviction for driving under The Influence (DUI) - had tweeted to say she was having a great time watching the 'Fix You' rockers.
She wrote: "I love Coldplay!!!!!!!!!!!!!!!!! W/my sis :) (sic)."