... but who's to blame? Perpetuating my hypothesis that nobody in Hollywood is happy, Heather Locklear has filed for divorce from her rocker husband Richie Sambora. "After 10 years of marriage, Heather has filed for divorce," the Melrose Place alum's rep tells People. "This is a private matter and there will be no further comment at this time." Er, think again: A little more than an hour after Locklear's flack started spreading the word, Sambora blindsided by the buzz told ABC News Radio, "It's completely untrue," noting that he even has Valentine's Day plans with his wife. Uh-oh.