06/20/2012 08:52 am ET Updated Jun 21, 2012

National PDA Day: Check Out The Worst Celebrity Kisses (PHOTOS)

Wednesday, we celebrated the most hallowed of holidays, National PDA Day. Now, to show what happens when PDA goes wrong, we bring you the worst celebrity kissses.

So, how do these less than sexy smooches make our "worst of" list? Three important qualifications:
1. Unlikely pairings/ awkward participants
2. More slop than smooch
3. Overall "ick" factor

Kim Kardashian and Kris Humphries' doom-tinged kiss, Paula Abdul and Simon Cowell's cringe-worthy lip lock and Will Ferrell and John C. Reilly's manly makeout session all make the cut. These stars certainly know how to turn it on (while turning us off!) for the camera.

Check out the worst celebrity kisses below, learn from their mistakes and put your newfound knowledge to good use. After all, this is the one day a little PDA is totally acceptable.

The Worst Kisses In Hollywood