Today's celebrity pictures feature Friends star Matthew Perry discussing his own personal alcohol and drug addictions and the benefits of drug courts at the Policy Exchange in London.
Also in the capital, Madame Tussauds unveil new waxworks of Angelina Jolie and Brad Pitt, and Nicole Scherzinger wears a thigh-skimming black dress as she leaves Shaka Zulu restaurant in Camden.
Emma Rigby wears a dramatic black gown with gold detailing as she arrives at the world premiere of Der Medicus at the Zoo Palast cinema, Berlin.
In New York, Kim Basinger dons a pinstripe Ralph Lauren suit as she attends the Grudge Match premiere, and Lindsay Lohan wraps up in a fur coat as she's spotted out and about in the city.
Miley Cyrus wears a festive fur-trimmed white crop top and matching briefs as she performs with a Santa Claus at the iHeart Radio Jingle Ball in Washington DC.
And in LA, Kim Kardashian is spotted Christmas shopping with North West.
Celebrity Pictures: 16/12/13 - 20/12/13
Naomi Gordon is news writer mainly covering entertainment news with a focus on celebrity interviews and television.
