Thursday is International Women's Day. In honor of the day, one of the top female leaders around the world, US Secretary of State Hillary Clinton, will be attending the Women in the World Summit in New York City.Angelina Jolie, Meryl Streep and Lauren Bush Lauren are expected to join Clinton at the event, now in its third year.

From Queen Elizabeth II (who is marking her 60th year on the throne) to Yingluck Shinawatra becoming Thailand's first female Prime Minister (and youngest in more than 60 years), to President Ellen Johnson Sirleaf's recent victory in Liberia to mark the beginning of her second term, there are now more female leaders in the world than ever before.

But it's just the begnning. 

Despite this momentum, there is a long way to go before women and girls can be said to enjoy the fundamental rights, freedom and dignity that are their birthright and that will guarantee their well-being . . . I urge Governments, civil society and the private sector to commit to gender equality and the empowerment of women . . . the energy, talent and strength of women and girls represent humankind's most valuable untapped natural resource, United Nations Secretary-General Ban Ki-moon said in a statement.

This year, the UN, which first recognized International Women's Day in 1977, is focusing on its theme, Empower Rural Women -- End Hunger and Poverty.

In honor of International Women's Day 2012, here's a look at some of the top current female leaders around the world.