Sambora and Richards in Italy May 22 (left); Spade and Locklear in L.A. May 20 Photo by: Splash / Sunset Photo and News
Denise & Heather: Still Feuding? | David Spade, Denise Richards, Heather Locklear, Richie Sambora
It's downright childish. But is it true? Did Heather Locklear and a pal recently park outside Denise Richards's Westlake Village house and blast Bon Jovi's "Livin' on a Prayer"?

Locklear stopped speaking to Richards after finding out that she is dating Locklear's estranged husband, Bon Jovi's Richie Sambora. But as PEOPLE reports in its new issue, a Locklear pal denies she pulled any Hollywood-turned-high-school hijinks: "It 100 percent never, ever happened."

Counters a Richards pal: "It is 100 percent true." (Math, Hollywood style.)

This much is certain: On May 20, Locklear, 44, joined pals, including rumored beau David Spade (who sources say is just a friend), for dinner at L.A. hot spot Republic.

That same night, Richards, 35 – who is now seeking a cut of Charlie Sheen's Screen Actors Guild pension in addition to sole custody of their two kids – watched from backstage as Sambora, 46, rocked out with Bon Jovi in Dublin.

The two then hopped a private jet and checked into a five-star hotel south of Naples.

Who needs drive-by serenades? They can make their own music.