how do i lock my facebook profile picture ALBUM?

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1. Login to your facebook
account and go to Account
>> Privacy Settings. (see top
right side of your profile).
You can also simply click
here to go to privacy
settings.
2. Now click on customize
settings link on that page.
3. Click on Edit album privacy
to view the privacy level for
all your albums.
4. Now the first album will be
your ‘Profile Pictures’. For
that album select “Custom”
option from the drop down
list with the album.
5. Now you will see a pop-up
on screen, select “Only Me”
option from the drop down
list for “Make it visible to”
option.