Got a text saying my iTunes account frozen

Hi all,

I received a text message saying:

"Your iTunes account has been frozen because we are unable to validate your account information. To avoid suspension Validate your info here: http://ow.ly/UHvoS"

Is this a valid message? This is not an apple URL so I was unsure about following it. I have had my account for years and use it regularly so why would this happen?

Emma