Looks like the Backstreet Boys might want to watch their backs. MTV News reports that last weekend at a concert in Berkeley, Calif., Offspring vocalist Bryan "Dexter" Holland bludgeoned life-size inflatable representations of Boys A.J., Brian, Howie, Kevin and Nick with a bright orange Wiffle bat. The performance art preceded the Offspring's "Cool to Hate," from the 1997 album "Ixnay on the Hombre" . . .
* The upcoming UPN broadcast of the Source Hip-Hop Music Awards may have more bite than most kudocasts. Pugilist and ex-convict Mike Tyson has agreed to be a presenter at the Aug. 18 awards show, an appearance that will be one of Tyson's first major public events since being released from his latest prison stint earlier this year. Other presenters lined up for the event include Will Smith, Lauryn Hill and Missy "Misdemeanor" Elliott. Performers will include Sean "Puffy" Combs, DMX & Ruff Ryders and Nas. The show will be taped at the Pantages Theatre in Hollywood for broadcast Aug. 20 . . .
* The first single for Billy Corgan's soundtrack for "Stigmata," due out in late August, will be a Corgan tune sung by Natalie Imbruglia. Also on the soundtrack is a new David Bowie song ("The Pretty Things Are Going to Hell") and remixes from Chumbawamba and Bjork . . .
* Tori Amos's double-disc set "To Venus and Back" will hit stores Sept. 21. The package features 12 new tracks as well as several live cuts from her last tour . . .
* Ice-T has signed with Al Teller's Internet label Atomic Pop, new home to Public Enemy. A new album is expected in September.
CAPTION: Mike Tyson, ready to give; Imbruglia, soundtrack-bound.