'Celeb Rehab' Postponed -- We Got No Big Drunks

It should be easier than finding oil in the Gulf ... but "Celebrity Rehab" has been put on ice because they just can't find a big star with a big problem.

Sources connected with the show tell TMZ producers of "Celeb Rehab" can't fill the roster for the new season, which was supposed to start shooting today.

As we first reported, Tila Tequila and Jason Wahler signed on, but there are still holes in the roster. Most important ... we're told there isn't a big headliner.

Our sources say producers offered Lindsay Lohan $1 million and her own show, but LiLo turned them down. We're thinking a good move on Lindsay's part.