SUCCESS OF GROSS-OUT FLICKS BEGETS MORE OF THE SAME.

Byline: Marilyn Beck & Stacy Jenel Smith

Ready or not, here they come - a flood of gross-out teen-age flicks following in the wake of this summer's stream of gross-out teen-age flicks that are making millions.

Sid Ganis, producer of Adam Sandler's current ``Big Daddy'' hit, already has ``Deuce'' in production, with Sandler serving as an executive producer, and former ``Saturday Night Live'' cut-up Rob Schneider starring as a fish tank cleaner-turned-gigolo.

Schneider, who wrote ``Deuce'' with Harris Goldberg, approached Ganis about his film in February. It was almost immediately picked up by Disney, went through only four months of pre-production - and will be in theaters on Dec. 10.

Ganis promises that, like ``Big Daddy,'' ``Deuce'' ``will be as daring, as raunchy as it can be and still get a PG-13 rating.''

Like many of the teen films now in preparation, ``Deuce,'' with a budget of $15 million, will not represent a big gamble for its backers.

And if it follows the lead of many of this summer's movies, it will be pretty much reviewer-proof.

Master on screen

Rapper-mogul Master P - recently cited in Forbes as one of show-business's top money-earners, with a take of $56 million last year - is making a concerted move into feature-film acting.

Last week, he completed a role as Nicolas Cage's friend-turned-enemy in the big-screen remake of ``Gone in 60 Seconds.'' Today, he's due to begin the indie ``Lockdown'' in Santa Fe, N.M. - playing a man imprisoned for a crime he didn't commit.

And, he tells us, he may join the cast of Keanu Reeves' soon-to-begin ``The Replacements'' as an NFL-substitute player - if his schedule can be coordinated to allow him to work on ``Lockdown'' and ``Replacements'' concurrently.

Master P, who is up for honors - including solo artist, album and video of the year - on ``The Source Hip-Hop Music Awards,'' airing Aug. 20 on UPN, tells us it was always part of his game plan to act in films ``once I got my music career going. You get a whole other hype in movies,'' he points out. He's also considering ``a wrestling movie at Warner Bros., lots of action movies, everything. I'm looking to be the next big black male actor.''

Climb every mountain

Chris O'Donnell, Bill Paxton and Scott Glenn are in Australia, going through rigorous training for the big-screen adaptation of the best-selling mountain-climbing saga ``Vertical Limit'' - which begins production in New Zealand next month.

Oddly enough, director Martin Campbell didn't know until the cast was set that Glenn not only does mountain climbing in real life, he's even a trained ice climber. He's also a motorcycle racer and sky-diving enthusiast - an ``adrenaline junkie,'' as he puts it.

The people of People

Tom Cruise, Adam Sandler, Rosie O'Donnell, Madonna and Muhammad Ali have tallied up as the top five most-requested celebrity photos in People magazine's 25th Anniversary Photo Collection and Sweepstakes.

As you may have seen, the magazine has been offering limited-edition signed celeb portraits as part of its silver anniversary activities, with more than 200 celebs participating and most of the proceeds earmarked for the personalities' favorite charities. Tom chose the Pediatric AIDS Foundation; Sandler and O'Donnell named Until There's a Cure; Madonna, City of Hope; Ali, Gilda's Club.

Good eeeevening

The turnout for Universal's July 27 festivities honoring the late Alfred Hitchcock, who would have turned 100 on Aug. 13, will include his ``The Birds'' star Tippi Hedren and Janet Leigh of ``Psycho.'' Also expected to be on hand is Hitchcock's daughter, Patricia. They'll join the crowds at Universal Studios Hollywood when a bust of the legendary director becomes a permanent fixture in the front of the courtyard.

Another `Beethoven'

Maybe you thought the ``Beethoven'' St. Bernard saga has gone about as - ahem - fur as it could go, but no! Production begins on ``Beethoven's Third'' Aug. 2. This time, the big ol' dog travels cross country with his family.

With reports by Stephanie DuBois.

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3 Photos

Photo: (1) SANDLER

(2) SCHNEIDER

(3) HEDREN