United Kingdom, July 14 -- Spice Girls star Mel B is always late because she has "no concept of time".

The 51-year-old pop singer was diagnosed with ADHD (Attention-Deficit/Hyperactivity Disorder) when she was in her 40s and she's convinced it explains her regular tardiness because her brain "works differently on so many levels".

She told The Telegraph newspaper: ""I have ADHD so I have no concept of time. I was only diagnosed with ADHD, and also dyslexia, in my 40s and I wish I had known about it when I was at school.

"I now understand that my brain works differently on so many levels - including time frames."

Mel went on to explain why she's always late, adding: "If someone says: 'We need to leave in 30 minutes', I think I can get a...