On the occasion of the World AIDS Day on Dec.1, Prince Albert II of Monaco and Princess Charlene joined HSH Princess Stephanie of Monaco for a charity auction.

Around 50 pieces of art, including paintings, sculptures and photography was auctioned. An exclusive picture of Prince Albert II and Princess Charlene during the Royal Monaco wedding was also included in the collection.

Princess Charlene looked stunning in a knee-length black, which she paired with black stilettos and a matching clutch. This is the second time that the princess joined her sister-in-law for the annual World AIDS Day program.

Princess Stephanie is the President of the Fight AIDS Monaco and has fought passionately for the cause. Every year, the foundation holds a charity auction, the proceeds of which are used for the various programs and campaigns adopted by the Fight AIDS Monaco. Besides this, they are also used to assist poor countries like Madagascar and Haiti.

Take a look at Princess Charlene's glam looks at the annual charity auction below.