Possible hack on AVG Free?

I see this has already come up on the Viruses & Threats page.

For the past week or so I have been getting a large pop-up, apparently from AVG, telling me AVG Free needs updating, despite the fact that I receive automatic updates. When I click "check for updates" on the AVG Free UI there are often no updates available, suggesting that the pop-up may not be genuine. This would imply that either my (Windows 7 Pro) PC or the AVG user database has been hacked. Do you have any suggestions?

Thanks Kishore. I see from your answer to Gary Pelphrey today that this pop-up is actually legit. In that case should I just ignore it, or is there some way of blocking it?

I see this has already come up on the Viruses & Threats page.