It wasn't until 2007 that David finally admitted he was romantically involved with Heather Locklear. "We did date there for a while. Gorgeous girl. She was great. We're friends, and now she's on ["Rules of Engagement"]," he told David Letterman. "She plays a girl that dates me that everyone says she shouldn't be dating," David added. "It's like even on my show that's the angle." Folks, here's your answer to why David's one of Hollywood's most illustrious bachelors.