April 18 was National Stalking Awareness Day, a public initiative to encourage victims of stalking to fight back and reclaim their safety and privacy.

High-profile celebrities are often among the 3.4 million adults in the U.S. who are victimized by stalkers every year. Icky fans are an inevitable part of the fame game, but some cases have gotten out of hand. 

Celebrities from the likes of talk show host David Letterman to superstar singer Madonna to Disney cutie Selena Gomez have all had to deal with creepsters who want to get near them, for whatever reason.

Here are celebrities who have had to deal with stalkers at one point or another. Reading some of these cases, you can't blame celebrities for wanting to escape the limelight.