Forget about wearing your heart on your sleeve. The latest fashion accessory sweeping Hollywood is legendary jeweler Tiffany & Co.’s Keys Collection. 

The small key shaped pendants are in such high demand they temporarily sold out across the country! (Not to worry, you can now purchase them online or in Tiffany & Co. stores)

From on set, to the streets of New York, to the red carpets of Los Angeles, Hollywood’s hottest ladies have been sporting the versatile necklaces to reflect their personal style.

PHOTO: Doutzen Kroes films a commercial for Tiffany & Co.

Leighton Meester gave the line an uptown twist, accessorizing her bright, fashion-forward ensemble with a lone platinum pendant.  Anne Hathaway went for simple elegance when she layered her key necklace to spruce up her casual daytime look. 

While Jessica Biel paired her 18 karat gold and Quatrefoil Key with a t-shirt, Kristin Scott Thomas made a statement at the 2009 SAG Awards with her stunning assortment of gold hardware: she matched 18 karat gold Elsa Peretti Diamonds by the Yard Sprinkle necklaces with Tiffany Key pendants in three shapes- oval, medallion and clover.