Who: Jennifer Lawrence
Where: 38th Annual Los Angeles Film Critics Association Awards

Best Actress Jennifer Lawrence works a playful and effortless updo with braided headband.

Get her look: Make two braids (one on each side of the nape) and secure each with a clear elastic. Bring each braid over to the top of the head and bobby-pin in place.

Who: Keira Knightley
Where: "Anna Karenina" Los Angeles Premiere

Keira Knightley keeps her retro rolled updo slightly messy for an effortless, elegant look.

Get her look: Apply styling mousse then blow-dry hair to one side. Starting from one side of your head, twist hair up into a 'roll' shape. Continue adding more hair to the roll as you work your way toward the back of your head, then tuck in the ends and bobby-pin in place. Repeat on the other side. Spritz hairspray all over for hold.

Who: Ashley Greene
Where: "Twilight Saga: Breaking Dawn Part 2" LA Premiere

Ashley Greene sweeps her wavy locks back into a romantic half-up by twisting and pinning the sides of her hair for a Grecian-inspired look.

Get her look: Part hair in the center. Curl hair sections with a 1-inch barrel curling iron. Gently run fingers through curls to soften into waves. Take a small section of hair from each side of the part, twist, then secure both at the back of the head with a hair barrette.

Who: Kristen Stewart
Where: "Twilight Saga: Breaking Dawn Part 2" LA Premiere

"Twilight" star Kristen Stewart channels Old Hollywood glamour wearing retro Veronica Lake-inspired waves -- with a modern twist.

Get her look: Add hair texturizer from roots to ends and hand-dry hair until completely dry. Make a deep side part. Spray 1-inch sections of hair with hairspray then curl them using a 1-inch barrel curling iron. Pin curls in place and let cool. Remove pins and gently brush out curls. Slick back one side of the hair, twist, and pin in place.

Who: Cameron Diaz
Where: "Gambit" UK Premiere

A cute bun adds a romantic touch to Cameron Diaz's look and shows off her long swan-like neck.

Get her look: Rough-dry hair and scrunch to add texture and volume. Blow-dry bangs forward with a small round brush, rolling at the ends to create a soft bend. To the rest of the hair, spray a hair texturizer to the roots and backcomb. Twist hair into a bun and bobby-pin in place. Pull out a few face-framing pieces. Spray with hairspray then tousle for texture.