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Mike Tyson is free at last. After months of marital sparring with Robin Givens, the world heavyweight boxing champion has been granted a divorce in Somerville, N.J. Actress Givens was a no-show for the final round, a 15-minute hearing. ”I don`t have grudges against anyone,” said the champ, 22, wearing a black pin-stripe suit. ”I understand everyone`s behavior because I am human also.” As for the winner`s purse, well, settlement details were not disclosed.

BUT WHAT ABOUT BERETTA? General Motors doesn`t win much these days, so victory over Chevy`s Cafe had to come from a road well-traveled: litigation. ”They`ve got more lawyers than we have employees,” observed Roger Brower, manager of the `50s-style bar and restaurant in Portage, Mich. Threatened with a nasty trademark infringement suit, the owners of Chevy`s Cafe hastily decided to create a new model with a Detroit-style bash. Indeed, patrons were invited to bash their best-with a sledgehammer on a rusty `57 Chevy. When it reopens for business Friday, Chevy`s will be known as Flip`s. Same chassis and engine-but better cushioned against lawyers.

NANCY JOINS REVLON There`s a new member on Revlon`s board of directors: Nancy Reagan. A company spokesman refused to divulge how much she will be paid, but said her

”insight” from traveling around the world and saying no to drugs ”will add an important additional perspective to the Revlon board of directors.”

JEAN HARRIS: I`M SORRY Still hoping for clemency, Jean Harris, jealous killer of ”Scarsdale Diet Doctor” Herman Tarnower, now says she`s sorry. ”Remorse has become an appendage to me,” Harris said from New York`s Bedford Hills Prison, her home since 1981. ”It`s like another skin; I live in it, and I always will.”

Harris, 66, contends nonetheless that Herman could have saved his skin when she confronted him about his other relationship. Instead of talking reasonably, she said, he called her ”crazy” and hit her. She hit back-with a handy-dandy pistol that crazy people are wont to use in lover`s quarrels.

STILL WET BEHIND THE WINGS Color Matthias Rust red. Two years after his daredevil flight to Moscow`s Red Square, Rust was told to stay on the ground in West Germany. After several meetings with Rust, 21, Hamburg`s state government rejected his petition to renew his pilot`s license. Too much ”unreasonable and reckless behavior,”

officials concluded.

WELL, HE MADE THEM LAUGH Sign in an Atlanta liquor store: ”Rob Lowe should check IDs. We do.”

IT`S STILL NOT KANSAS, BUT . . . And introducing: the new, revised ”Wizard of Oz.”

Yes, the venerable flick is being re-released on video this August-but accompanied by 17 minutes of previously excised MGM footage, all of it after the finale of the 1939 version.

For example, there`s the animated pink-and-blue mosquito whose stings soften up Dorothy for the Wicked Witch`s Winged Monkeys. It precedes the wild jitterbug by Judy Garland and her crew, which also was missing from the original film.

Then there`s the Tin Man, bewitched into a buzzing beehive. Don`t remember it? It`s on the $25 video, along with Buddy Ebsen, as the original Tin Man, singing ”If I Only Had a Heart.” (Ebsen quit the film because of an allergic reaction to aluminum dust in his silver makeup.)

(Ahem. There`s also a Procter & Gamble commercial. It runs 90 seconds, at the un-erasable beginning.)