To get sunken-in cheeks, use a gray/blue shadow (try MAC Eye Shadow in Copperplate, $14.50). Apply it in circular motions just under your cheekbones, blending out towards your ears.

For your eyes, go for a sexy smoky eye (it even works for guys!). Apply a dark eye shadow (like CoverGirl Eye Enhancers 1-Kit Shadow in Shimmering Onyx, $2.82) on the inner corners of your eyes, blending it across your lids and up towards your brows. Use black eyeliner to further darken and emphasize your eyes by lining lash lines and inner rims.

Bonus: For the "Twilight" effect, dust glitter all over your face for that "marble skin look." Try MAC Iridescent Powder in Silver Dusk, $22.

Dressing up as your favorite "Mad Men" duo is a cinch. For Mr. Draper, have your guy wear a suit and slick his hair into a '60s side part (try using a strong hold gel or pomade, like Redken Hardwear 16 Super Strong Gel, $16). For Betty, check out these tips below:

Start with a sheer foundation to even out your skin tone. Then use black gel eyeliner (try Bobbi Brown Long Wear Gel Eyeliner, $20) to thinly line your upper lids, winging the ends out a bit. Then apply mascara. Betty usually wears a bold lip color that coordinates with her clothing, so depending on what '60s-style dress you choose, try one of these shades: MAC Lipstick in Vegas Volt, $14 or MAC Lip Pencil in Red or Cherry, $13. Don't forget to add a rosy-pink blush, like MAC Blushcreme in Posey, $18.50.

Need to shorten your hair to copy Betty's bob? Then check out this how-to. Or for tips on dressing up as other "Mad Men" women, check out these how-tos.

Obviously, you'll need to break out your trendiest outfit (and your biggest sunglasses) to portray Zoe. To complete the look, check out these makeup tips.

First, either apply foundation that's a shade darker than your skin tone or use copious amounts of bronzer all over to get her tanned skin tone. And not to be mean, but to complete this look, you'll need to draw on some marionette lines (wrinkles from the base of your nose to your lips). To make them look real, use a taupe-colored eyeliner or brow pencil to draw lines on each side of your face. Then use a concealer that's two shades lighter than your skin and blend it on either side of the lines to make that skin look more raised than the wrinkle (be sure to blend well). Finish with setting powder.

For her signature dark lip color, try a burgundy lip pencil, then follow up with a burgundy or dark red lipstick (like Revlon Matte Lipstick in Fabulous Fig, $6.99). Don't bother with much eye makeup, you'll be wearing your gigantic sunglasses all night!

It's easy to go as your fave "Star Trek" characters with these tips. Just add some Vulcan ears and uniforms and you're set!

For Spock, the biggest things (besides the fake ears, which you can pick up at a costume store) are the eyebrows. You'll want yours to arch up, but don't worry; you won't need to do anything drastic to your actual brow shape. To conceal the outer half of your eyebrows, comb glue from a glue stick (MAC senior makeup artist Jenn Karsten swears it will wash out) through your brows and then press them down, and cover them with powder. Now conceal them by with a full-coverage concealer that matches your skin tone (apply it with a sponge for heavier coverage). Then, use a brow pencil to draw on the appropriate Vulcan brows.

For Uhura, the makeup look is pretty simple. Apply a black gel liner (like Bobbi Brown Long Wear Gel Eyeliner, $20) with a thin brush (like MAC 209 Eyeliner Brush, $17.50). Wing the liner out to create a cat-eye shape. Karsten's tip for getting a straight, defined line: Use a triangle sponge and place it at the edge of your eye (play with the angle of the sponge to find the best line for you), then draw on the line using the sponge like a ruler. Complete the Uhura look with false lashes (this how-to video will help you apply them).

For her hair, try a high, sleek pony (see a tutorial of the look here).

This costume is ideal for anyone with a wedding dress they'd like to wear again. (No wedding dress? You could dig up an old bridesmaid dress and be a "bridesmaidzilla.") The idea is a bride gone crazy, so be sure to make unreasonable demands on everyone all night (well, unless you want be invited to next year's party!).

For the makeup, start by applying traditional wedding-day makeup. Think bright pink blush (but apply way too much) and a nude/pink lip. Karsten recommends applying a ton of lip gloss so you look overdone (Try mark Shine Tubes Hook Up Lip Gloss, $5.50, it's small enough to keep with you to reapply all night).

For your eyes, create a smoky eye (to make you look a bit evil) with plenty of shimmer on top. Then apply dramatic false eyelashes -- but make one eye uneven so you look disheveled. For help applying them, check out this video.

For your hair, try any of these updos, and after you're done, mess it up (try taking a nap or just rolling around on your bed) to complete the crazed look.