Adorable 10-year-old girl jams on-stage with Paul McCartney

She wasn't taking 'no' for an answer.

Meet Leila Lacase, the 10-year-old Argentinian who popped up on stage with Paul McCartney and demanded a jam session.

The pint-sized star was spotted by McCartney during his Buenos Aires gig, as she was holding a sign requesting for the former Beatles star's autograph.