They do! They do! They're Donna McKechnie, of A Chorus Line renown, and John Hillner, of Big, Company and Crazy For You, and they're set to appear in I Do! I Do! at Queens Theatre In The Park, March 6-16. Tom Jones and Harvey Schmidt's chamber musical, about the bumps and blessings of a lifelong marriage, had a critically praised Off-Broadway revival in 1996 starring Karen Ziemba and David Garrison. The 1966 show, by the authors of The Fantasticks, is based on Jan de Hartog's comedy, The Fourposter.

McKechnie (Agnes) received a Tony for her Cassie and a 1996 Fred Astaire Award for Best Female Dancer for her work in State Fair. Her other Broadway credits include On The Town, the original Forum, The Education Of H*Y*M*A*N K*A*P*L*A*N and Promises, Promises.

Christopher Catt directs the musical, which will boast sets by Robert Klingelhoefer, costumes by David Mills and lighting by Brian Dunn.

Other theatre events in the Queens Theatre In The Park (Q-TIP) season include the Jean Cocteau Rep production of Brecht's Mother Courage, Mamas, a musical revue about motherhood by Helen Butleroff; cabaret performances by Ann Hampton Callaway (March 22) and Leslie Uggams (April 26-27); opera spoofery by La Gran Scena Opera Co. (May 3).

For tickets and information on Q-TIP events, which take place in Flushing Meadows Corona Park "directly behind the Queens Art Museum and Ice Skating Rink," call (718) 760-0064.

--By David Lefkowitz