By Emily Feimster When it comes to getting your foot in the door in Hollywood, it's got a little bit to do with talent, a little to do with luck, and a lot about who you know. A good publicist never hurts either! As a result, Tinseltown is crawling with some of the most untalented people in the world who somehow managed to become superstars. So some of them are hot -- that still doesn't mean they can act. If you go to movies and watch television, you know what we mean. No doubt you're formulating your own list even as you read this. Who are the worst actor-stars Hollywood - the ones who leave us scratching our heads as to how the heck they got famous? Here are 10 - in no particular order, I might add, because when you stink, you stink.

Keanu Reeves - Where do I start? This guy plays the same part in every movie - dull and boring. He was perfect for the "Matrix" movies because his character hardly had to say anything. And, sure, he was good in "Bill & Ted's Excellent Adventure" but bad acting helped make the role. Is it just me or was he the only one with an American accent in "Much Ado About Nothing?" Then there's his surfer-like accent in "Dracula" - dude, that's like, unheard of in Transylvania. Not to mention his monotone attempt to be philosophical in "The Replacements."

David Caruso - First of all, what egotistical idiot leaves "NYPD Blue" after a huge first season to pursue a movie career? Oh wait, what am I talking about? His performance in "Proof of Life" did bring me to tears - but not in the good way. How in the world "CSI: Miami" is still on the air is beyond me. The show could be used as a weapon to thwart terrorism. Our enemies would be goners after having to watch multiple episodes of Caruso putting his hands on his hips, tilting his head, and delivering one of the cheesiest lines known to man.

Tara Reid - It will take more than an exposed boob to give this girl a long acting career. With her raspy-voiced performances in movies like "Body Shots," "Josie and the Pussycats," and "My Boss's Daughter," it's a wonder she's still around. Look on the bright side, though, if they were to give an Oscar for dancing on tables, she would be a shoo-in!

Ben Affleck - Whew, this guy is holding on to fame by the skin of his teeth. After gigantic flops like "Gigli," "Bounce," "Jersey Girl," and "Surviving Christmas," it's easy to see why he's been laying low lately. If he's smart, he'll just marry Jennifer Garner. She's bound to have a more successful career.

Sylvester Stallone - Ok, so "Rocky" was an inspirational hit movie, and "Rambo" was a blockbuster, but that should have been it for Sly. Every time he tried to squeeze out of his very narrow range, things got painful. Then he'd make yet another sequel, and those got painful too. Things couldn't have been much worse than when he made "Stop! Or My Mom Will Shoot!" I think I would have preferred being shot.

Mary-Kate & Ashley Olsen - I certainly understand their original appeal - they were the cute twins on "Full House who said, "You got it, dude!" But now I just don't get it. Somehow these girls have been able to create a multi-million dollar empire based on the worst home videos ever made. "Passport to Paris," "Our Lips Are Sealed," come on! They sing off-key, loudly. Not really a surprise that their first major motion picture, "New York Minute," tanked at the box office.

David Hasselhoff - I've got one word for you: "Baywatch." Need I say more?

Freddie Prinze Jr. - As much as I would love to talk about what a horrible actor this guy is, I'll let his movies speak on my behalf - "Down to You," "Boys and Girls," "Summer Catch," and "Scooby Doo 1 & 2." What? You never saw half those movies? Count yourself lucky. At least he's got one thing going for him - he managed to snag Sarah Michelle Gellar.

Madonna - Yes, Madonna is a singer (a lousy one at that) but she's done enough horrible movies to be on this list. "Shanghai Surprise" alone justifies it. Then there's "The Next Best Thing," "Swept Away" - these performances are almost too painful to watch. But for what she lacks in talent, she makes up for in marketing genius. After all, she managed to convince the world that she should be a huge star.

William Shatner - He's always been a cheesy actor. It doesn't matter what he's playing. From "Star Trek" to "Boston Legal" (on which nobody, including ol' Bill, sounds as if they're from Boston), this guy just won't seem to go away. For the love of entertainment, would somebody please beam him up?