Beauty Recap: Kim Kardashian's Über Bun, Rachel McAdams's Blonde Upgrade, and More

This trend might be on the way out, but Rachel Bilson keeps her favorite trend fresh with sleek bangs and natural waves at the the Chanel Collection Croisiere Show 2011 in France.

See more of Rachel Bilson's hairstyles.

Penelope Cruz pairs her ponytail with short fringe in the front at the premiere of Pirates of the Caribbean: On Stranger Tides in California.

Lady Gaga dyes her bangs black to stand against her platinum white strands at the 64th Annual Cannes Film Festival in France.

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Taking a break from her usual beachy waves, Gisele Bündchen pulls her hair back into a bun at the 2011 Global Environment Citizen Awards in NYC.

Keira Knightley flaunts her flawless skin and adorable bob on Late Night with Jimmy Fallon in NYC.

See more of Keira Knightley's hairstyles.

Rachel McAdams stands out with monochromatic blonde locks and a pop of pink on her cheeks at the Midnight in Paris photocall in Cannes.

Reese Witherspoon trades in her sleek blowout for amped up curls with volume in the front at the Sydney premiere of Water for Elephants.

See more of Reese Witherspoon's hairstyles.

Karolina Kurkova makes a sexy statement at the 64th Annual Cannes Film Festival in France with softly teased curls and shiny lips.

Uma Thurman opts for a loose messy bun on top of her crown at the 64th Annual Cannes Film Festival in France.

See more of Uma Thurman's hairstyles.