Britney Spears ''lost'' her mind when she got to meet Brad Pitt because he's ''so sexy''

The 'Pretty Girls' singer is one of the biggest pop stars in the world, but when she saw Brad Pitt at the Teen Choice Awards 10 years ago she ran to him to tell him she was his ''biggest fan''.

On reflection Britney confessed it was one of her most ''uncool'' moments and she ''completely died'' because she was so awe of him.

Speaking on 'The Kyle and Jackie O Show' on Australian radio station KIIS 106.5, Britney gushed: ''The most star-struck I was with was probably Brad Pitt. I saw him probably 10 years ago at the Teen Choice Awards. He had really long hair. I completely died. I ran! I was dressed in high heels (and I ran) towards him! Like an idiot, I ran to him and I was like, 'Oh my God, I'm the biggest fan.' I kind of lost my mind for a second. I was so uncool ... it was probably one of my most uncool moments ... But he is just so sexy.''

The 33-year-old singer thinks the 'Mr & Mrs Smith' actor - who is married to Angelina Jolie - would avoid her if they were to be in the same company again, although he was ''really nice'' and signed an autograph for her.

She added: ''He was really nice but he'd probably dodge me, but I got a picture and an autograph ... I acted, like, four years old.''