British Prime Minister David Cameron (left) laughs as he speaks with (from right) Finland's Prime Minister Jyrki Tapani Katainen, Croatian Prime Minister Zoran Milanovic, German Chancellor Angela Merkel and Estonia's Prime Minister Andrus Ansip during a round table meeting at an EU summit in Brussels on Dec. 13, 2012. (Associated Press)

Photo by: Geert Vanden Wijngaert

British Prime Minister David Cameron (left) laughs as he speaks with (from right) Finland's Prime Minister Jyrki Tapani Katainen, Croatian Prime Minister Zoran Milanovic, German Chancellor Angela Merkel and Estonia's Prime Minister Andrus Ansip during a round table meeting at an EU summit in Brussels on Dec. 13, 2012. (Associated Press)