Stars In Masks!

Who's that pig? See Keira Knightley and other stars (Britney! Celine!) wearing wacky masks

01 of 10

KEIRA KNIGHTLEY

KEIRA KNIGHTLEY
Ramey; Matrix/Bauer-Griffin

The actress and her friends hammed it up for Knightley's 21st birthday party at London's Café Royal.

02 of 10

BRITNEY SPEARS

BRITNEY SPEARS
Fame; INF (inset)

The pop star cha cha cha-ed out of Hollywood club The Green Door in a sombrero and eye-mask with amiga Alli Sims (not pictured).

03 of 10

DIDDY

DIDDY
Roger Wong/INF

The 'P' was for party, not V for Vendetta, when the Bad Boy Records mogul hit a Halloween Party at New York's Cipriani restaurant.

04 of 10

GWYNETH PALTROW

GWYNETH PALTROW
Bauer-Griffin;Nick Price/Startraks(inset)

Paltrow hopped around New York with daughter Apple in search of Halloween candy.

05 of 10

PRINCE HARRY

PRINCE HARRY
Goff/INF; Tim Ockenden/AP

The Commodore-in-Chief of small ships and diving gets wet on a visit to the Royal Navy's diving squadron in Portsmouth, England.

06 of 10

ASHLEY OLSEN

ASHLEY OLSEN
Flynet

Olsen donned a mask to hide her face from photographers at Hollywood stylist Estee Stanley's wedding.

07 of 10

PETE WENTZ

PETE WENTZ
Scott Kirkland/INF; Jen Lowery/Startraks (inset)

The Fall Out Boy bassist hit the red carpet at the MTV Video Music Awards in a green-as-a-gecko mask.

08 of 10

MICHAEL JACKSON

MICHAEL JACKSON
Wenn; MJ Kim/Getty (inset)

The Gloved One became the Hooded One during a shopping spree on Melrose in L.A.

09 of 10

CELINE DION

CELINE DION
Newspix/Rex USA; Landov (inset)

Feeling under the weather while Down Under, the songstress wasn't taking any during her 2008 Taking Chances world tour.

10 of 10

JAMES GANDOLFINI

JAMES GANDOLFINI
Hector Vallenilla/Pacific Coast News

And you thought Tony Soprano was a killer. Gandolfini – dressed up as Jason from Friday the 13th – goes trick-or-treating in New York.

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