Four years ago President Obama was sworn into office for the first time and today on January 21, 2013, President Obama took his second oath again at the 2013 inauguration. This year's celebration included thousands of happy supporters and performances from the likes of Kelly Clarkson and Beyonce, who did a beautiful rendition of The National Anthem.

A parade which included more than 2,--- members of the military also occurred. President Obama took a private oath of office in a private ceremony at the White House on Sunday but today was the day he gave another historic speech and thousands of supporters came to D.C. to watch the significant and historic event.

Today Vice President Joe Biden will also be sworn in for his second term.

The ceremony started at 11:a.m. EST and Obama delivered his inaugural address at approximately 11:30 a.m. During his speech he spoke of social issues facing today including gay rights. This is the first time in history a president has addressed gay rights in an inaugural address. He said during his speech,  "Our journey is not complete until our gay brothers and sisters are treated like anyone else under the law," he said. "For if we are truly created equal, then surely the love we commit to one another must be equal as well."

He also spoke about immigration reform and pledged to make it one of his top priorities in office this year.

 "Our journey is not complete until we find a better way to welcome the striving, hopeful immigrants who still see America as a land of opportunity; until bright young students and engineers are enlisted in our workforce rather than expelled from our country," he said.

The President also addressed the hot-topic of climate change and spoke of the need to "respond to the threat of climate change."

 "Some may still deny the overwhelming judgment of science, but none can avoid the devastating impact of raging fires, and crippling drought, and more powerful storms," he said.  "The path towards sustainable energy sources will be long and sometimes difficult.  But America cannot resist this transition; we must lead it.

Below are some noteworthy photos from Twitter taken from Barack Obama's presidential inauguration.