Jennifer Aniston and her on-again beau John Mayer celebrated Barack Obama's victory in style at Courtney Cox's post election party.

The Friends actress and her husband David Arquette invited friends and family, including Sacha Baron Cohen and Isla Fisher to their home in Beverly Hills.

"David was in such a good mood, he walked outside his gate and poured champagne for the paparazzi," one insider told E! News.

George Clooney also lead the celebrations by congratulating Obama on a historical win.

He told Usmagazine.com, "Now it's time to begin unifying the country so we can take on the extraordinary challenges that this generation faces."

Meanwhile Oprah and Brad Pitt celebrated in Chicago where Obama gave his acceptance speech.

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