Hello,
Invisalign will still work even if you have crowns on your teeth. It actually might even be a better option (as opposed to regular braces), because the crowns can be damaged in the braces removal process, whereas Invisalign does not require removing anything from the teeth. The only limitation with having crowns during Invisalign treatment is the placement of attachments (which are small buttons glued onto the tooth to aid in certain tooth movements). We usually avoid placing attachments on teeth that are crowned, because the bonding agent does not work as well with porcelain as it does with real tooth structure. If a tooth that has a crown requires an attachment, there is a special bonding agent meant to work with porcelain, so it can still be done.