'Celebrity Rehab' Lacking Celebrities

There is no shortage of celebrities that need rehabilitation -- but the VH1 show "Celebrity Rehab with Dr. Drew" can't get any of them to star on the show next season.

Sources close to the production tell TMZ they have struck out left and right trying to find A, B, or even C-list celebs for the show. As we first reported, they had their eyes on Lindsay Lohan and Heather Locklear, to name a few, but were quickly shot down.

The show was able to get a tentative commitment from a few D and F-listers, but our sources say the network rejected them.

We're told there was a deadline last Friday to lock down the cast, but since they don't have ANYONE signed on ... the deadline was extended to Wednesday.

One thing is clear -- no cast, no show.