[Terry McAuliffe, Will.i.am, Arianna Huffington. Photos via Alex J. Berliner]

Last night, the BIG inaugural party belonged to Huffington Post's Ariana Huffington at the Newseum in Washington D.C.  Guests included John Cusack, Terry McAuliffe, Will.i.am., Sting, Sheryl Crow, Val Kilmer, John Cusack, Tracey Edmonds, Marisa Tomei, Robert De Niro, Josh Grobin, Pete Wentz, Sarah Silverman, Jessica Alba, Jennifer Beals, Diane von Furstenberg, Cash Warren, Ashton Kutcher, Demi More, Teri Hatcher, Gerard Butler, Larry King, Jesse Jackson, and many many more.  The main party tonight, of course will be the official Inaugural Ball at Union in D.C. where President Obama will be with his wife Michelle.  Tickets are sold out, though you can find some for sale online with a ticket price of around $2k a piece.

More story and photos below:

For a list of the main inaugural balls around D.C. and other cities, as well as where you can find the tickets for them tonight, GO HERE.

Cash Warren, Jessica Alba, Sting, Sharon Stone

Grace Hightower, Marisa Tomei and Robert De Niro

Arianna Huffington & Jesse Jackson

Diane von Furstenberg and Arianna Huffington