PDA can be uncomfortable to watch no matter who it is, but celebrities have a way of truly raising the stakes in the art of the gross make-out!

Whether it's tongues on full display, uncomfortable face sucking or age differences that are downright creepy (or illegal), check out our round-up of celebrities who we truly had no interest in ever watching lock lips! Just make sure you don't view this right before or after a meal!

1. Pam Anderson and Tommy Lee

Pamela Anderson and Tommy Lee make-out

The sexpot couple of the mid '90s took every opportunity possible to make out for the camera and their escapades resulted in the first-ever celebrity sex tape!

2. Hugh Hefner and Kendra Wilkinson

Hugh Hefner and Kendra Wilkinson make-out

The reality star and former Playboy pinup makes out with death. Oh wait, sorry, that's Hugh Hefner. Notice how she's avoiding his lips and probably looking for his wallet.

3. Omarosa and Michael Clarke Duncan

Omarosa and Michael Clarke Duncan make-out

This doesn't seem too bad, right? We just had to include it because we can't BELIEVE the Apprentice star is dating the dude from The Green Mile. Plus, we have no interest in seeing Omarosa smooch anyone. Ever.

4. Paris Hilton and Doug Reinhardt

Paris Hilton and Doug Reinhardt make-out

With moves like this, we're just glad Doug is long out of the public eye these days. Now if only Paris could follow him...

5. Liza Minelli and David Gest

Liza Minelli and David Gest make-out

Okay, seriously? WTF?! We're gonna go throw up breakfast now.

6. Tom Cruise and Katie Holmes

Tom Cruise and Katie Holmes make-out

Before their impending divorce, TomKat took every possible opportunity to make-out in front of the cameras.

7. Angelina Jolie and Billy Bob Thornton

Angelina Jolie and Billy Bob Thornton make-out

Before Brad Pitt, let's just say Angelina did a major downgrade in the looks department.

8. Mariah Carey and Nick Cannon

Mariah Carey and Nick Cannon make-out

This doesn't look uncomfortable. Nope. Not even a little bit.

9. Courtney Stodden and Doug Hutchinson

Courtney Stodden and Doug Hutchinson make-out

The marriage between the 17-year-old Courtney and 52-year-old Doug is legal in some states and illegal in others. However, their make-out sessions should be illegal everywhere.

10. Al and Tipper Gore

Al and Tipper Gore make-out

Before he started making documentaries about the environment, Al was grossing America out with this make-out session in 2000 while he ran for President.

What do you think is the grossest celebrity make-out pic?

Photos courtesy of Fit Perez, The Nervous Breakdown, celebrities.gearlive.com, gossiprocks.com, Celebrity News Buzz, Holy Taco and The Gossipers