Kelly Osbourne has many regrets but this one tops the list! She nearly attacked a fan of hers in a London fashion shop.

The fan came right up to Osbourne and stuck her finger in Kelly's face, shouting 'it's Kelly Ocbourne!' Osbourne recalls.

This pissed Kelly off and she grabbed the girl's finger and shouted back at her. 'Don't f**k with me, or I'm going to break your f**king finger off.' Reported Digital Spy.

Osbourne claims if she could she would react differently after all her rehab and therapy. But it's a little too late and she has lost many fans over the incident.
Source: Digital Spy