Heather and Denise bonded in 2001 when Denise appeared on Heather's sitcom "Spin City." (It's the same set where the brunette met her husband-to-be, Charlie Sheen.) After Denise and Charlie wed, they frequently socialized with Heather and her then-husband, Richie Sambora. When both couples split in 2006, Denise moved down the street from Heather in the Los Angeles neighborhood of Westlake Village. But when Denise started dating Heather's ex just three months after filing for divorce from Charlie, she officially became the neighbor (and friend!) from hell. Fortunately for Heather, Denise moved away from the 1.2-acre home just over a year later.