Guy Hot: Tousled Tresses
"So many women wear their hair straight, and I think that's boring. Her wavy hair here is unique, and there's just something beautiful about it." James, 25
If you want to copy Kim Kardashian's look, try a clampless curling iron for foolproof, wind-blown waves. (We love the Remington T-Studio Ceramic Pearl Professional Curling Wand, $25.) Be sure to use a heat protectant spray like John Frieda Full Repair Sheer Mist, $9.99, to guard your hair from the hot-tool temps.
Girl Hot: Straight, Glossy Strands
What he says: "I wouldn't be attracted to a woman with super shiny, overdone hair. Erik, 39
What she says: "Her face looks slimmer here. I think the straight hair complements her cheekbones better." Kenya, 27
To get super-sleek hair like Kim's, give yourself a gloss treatment with Alterna Caviar Anti-Aging 3-Minute Shine Boost, $25. Then use a large round brush when blowing out your hair. The bigger the circumference of the brush, the straighter and smoother your strands will be.
Guy Hot: Face-Framing Fringe
"I think it looks cool and mysterious when a girl has one eye almost covered by her bangs. It's definitely sexy." Michael, 22
To get your bangs to fall just like Jessica Stroup's, use a dab of styling cream and blow dry them with a round brush to add some bend to the ends.
Girl Hot: A Pinned-Back 'Do
What he says: "She looks young and cute...but I wouldn't say she looks hot."Erik, 30
What she says: "You can see her face so well. Pulled-up bangs are young and fresh. Jeanne, 40
Before you comb back your fringe, spritz them with a volumizer like Living Proof Full Thickening Mousse, $24, and hit them with a few seconds of heat from the blow dryer to give them some sexy lift. Don't worry about pinning them back perfectlyJessica proves that a little messy can be fun.
Guy Hot: Free-Flowing Tresses
"I love when a woman wears her hair down! It makes me fantasize about running my fingers through it." Paco, 30
For Megan Fox's beachy waves, try Suave Professional Captivating Curls Whipped Cream Mousse, $2.99, to define your hair's natural texture without the crunch.
Girl Hot: A Sleek Ponytail
What he says: "I feel like her head must hurt from that tight hair." Erik, 30
"This look means business, and I can see wearing this style to work. I feel like I'd respect a woman with this hairstyle and take her more seriously." Kristi, 29
To get Megan's flyaway-free 'do, spritz hair with a firm-hold hairspray like L'Oreal Paris Studio Line Mega Hairspray, $4.99, and use a paddle brush to smooth out the sides before pinning it back.
Guy Hot: Side-Swept Bangs
"Side bangs are sexier and more interesting. They also make her look more mature." Bryce, 23
If you don't have bangs, you can fake asymmetrical fringe like Jennifer Hudson does here. Create a side part and pin the front section of your hair behind your ear. Let the rest of your hair fall naturally.
Girl Hot: Blunt Bangs
What he says: "These make her look young and they're too choppylike maybe her barber didn't like her." Eduardo, 24
What she says: "She looks fashionable, as if she's on top of the most current trends. I'd be asking her for hair advice!" Fernanda, 34
To copy Jennifer's bangs, work a matte paste through the ends like Mizani Defyne Wax, $12.79. Focus on small sections since you want to take the time to separate strands for a deliberate, piecey look.
Beauty Fail: Too Many Trends
"She looks like she's trying too hard with all that stuff. They're weighing her down." Peter, 22
"She looks silly. I wouldn't take her seriously if I saw her at a party or anywhere else." Fernanda, 34
Hats and earrings are a great way to showcase your personality, but wear too many things at once and your guy won't be able to focus on what you're saying. To avoid an accessory overload like Hilary Duff, stick to one big piece at a time.
Guy and Girl Hot: Simplistic Beauty
"I think it's so much better when a pretty girl just looks like her natural self." Zachary, 39
"She looks more confident because she's not trying that hard and is letting her natural beauty shine through." Sandra, 27
Proving that less is more, Hilary lets her pearly whites and flawless skin do the talking. Start with a foundation like CoverGirl Natureluxe Liquid Silk Foundation, $11.98, and finish it off with Tarte Provocateur Amazonian Clay Shimmering Powder to even out your complexion with a glowing touch.
Guy Hot: Smoky Eyes
"When I'm out at a bar or club, I always notice smoky eyes on women. I'd definitely dance with her!" Alex, 30
To copy Heidi Klum's super-sultry eye, go for a palette like Dior 5-Colour Eyeshadow in Gris Gris, $58, that includes all your must-have smoky shades to create the look. Top off your eyelashes with a mega mascara like MAC False Lashes, $18.
Girl Hot: Bare-Bones Makeup
What he says: "Her makeup makes her look more mature. It's nice, but it's kind of boring." Peter, 22
What she says: "This look suits her age better. She does have three kids, so I'd imagine that she'd want to look appropriate at all times!" Jeanne, 40
When you go easy on the eyeshadow and lip color like Heidi, you want to make sure you have luminous skin to prevent you from looking washed out. Try a smooth, breathable base like Maybelline Fit Me Foundation, $6.99, and add a pop of color to cheeks with a cool-pink blush like Benefit Cosmetics Bella Bamba, $28.
Guy Hot: Simple, Defined Eyes
"I love a woman's eyelashes and this look really shows them off. Her eyes look great!"Oumanou, 26
The trick to ultra-defined eyes is to draw a thick line as close to the inner rim as you can. Try Physicians Formula Shimmer Strips Custom Eye Enhancing Gel CreamLiner Glam Collection for Brown Eyes, $10.95, a trio of long-lasting gel eyeliners that you can layer for a gleaming effect.
Girl Hot: Bright Eye Makeup
What he says: "Oh my God, I think she looks like a clown." Miles, 38
What she says: "I love her eyeshadow. The green says, 'I'm ready to party!'" Nina, 24
To get Jessica's mermaid eyes, choose a palette like Lancome Color Design in Teal Fury, $48, which takes the guesswork out of creating such a brightly colored eye since it includes all the shades you need.
Guy Hot: Bare, Glossy Lips
"I go crazy over plain lips! They're sexy. Her lips look shiny and kissable. Plus, I don't have to worry about getting red lipstick on me." Ricardo, 29
Use a nude hue like Black Up Lip Gloss in GT05, $19, to get Gabrielle Union's naturally pretty pout.
Girl Hot: Red Lips
What he says: "The red looks like she has so much makeup on. She really doesn't need it." Jacky, 28
What she says: "She has wonderful lips, and by wearing red lipstick, she's pointing them out. Chrystal, 22
For a bright crimson pout like Gabrielle's, use L'Oreal Paris Infallible Le Rouge Lipcolor in Ravishing Red, $9.99.
Guy Hot: Natural-Looking Makeup
"I think a simple look is prettier. I don't like when a woman's makeup has me wondering what her face would look like without it. I like knowing what she looks like, whether she's wearing makeup or not." Oumanou, 26
Complement eyelashes with L'Oreal Paris Double Extend Eye Illuminator Mascara in Black Quartz, $10.95, which has a lengthening formula on one end and a light-reflecting top coat on the other. Apply a nude color on lips like Tarte LipSurgence Natural Lip Luster in Buff, $24, to complete Leighton's simple-but-sexy look.
Girl Hot: Dramatic Makeup
What he says: "Her makeup looks crazy, like she got carried away by accident." Bryce, 23
What she says: "She looks good all made up! I don't understand why there's a stigma against women who wear a lot of makeup. I think this brightens up her face." Bettye, 31
When using bold eye makeup, take a cue from Leighton and finish off your look by applying silver shadow in the inner corners of your eyes. (Try Hello Kitty for Sephora Charmmy Eyeshadow Stick in Snowflake, $16.) That pop of light will keep your makeup sexy instead of raccoon-like.
Beauty Fail: Neon Pink Lipstick
"These pink lips have got to go. She looks like she's in junior high school!" Eric, 35
"A pink that bright should stay in a Marc Jacobs ad. Abigail, 31
Okay, so maybe candy pink only works on the fashionable streets of New York City, but if this hue is your thing, choose a deeper pink like CoverGirl Lip Perfection Lipstick in Siren, $6.99, to avoid looking like a teenybopper à la Amanda Seyfried.
Guy and Girl Hot: Berry Lipstick
What he says: "This shade makes her lips seem bigger. It looks better with her skin and hair color." Jose, 32
What she says: "She looks more regal and pretty in a deeper lipstick. It's bright, but wearable." Patricia, 31
If you'd rather leave red lipstick to fashion icons like Gwen Stefani, take a cue from Amanda and tone it down by choosing a shade that's not as bright. Try Shiseido Shimmering Rouge in Desire, $25.