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Jennifer Aniston, Ellen DeGeneres

The Ellen Degeneres Show

Jennifer Aniston got John Mayer warmed up for his Grammys performance at her 40th birthday party Saturday night at her Beverly Hills home.

Sources tell E! News exclusively that Aniston and Mayer danced and huddled close all night at the bash, which Aniston hosted at her new home. "She looked hot and she and John looked really happy," says a source.

The affair was a star-studded one. Among the guests were Oprah Winfrey, Sheryl Crow, David Arquette and wife Courtney Cox Arquette, Tobey Maguire and wife Jen Meyer, Laura Dern, Kevin Nealon, and Tom Hanks and Rita Wilson. (Brangelina, predictably, were not in attendance.)

The party was held inside and outside of her sprawling hillside home.

We're told that the party began shortly after 7 p.m. and revelers partied well into the morning past 2 a.m.

Another bonus for Jen for the night: she kept the media at bay. "The police kicked all the paparazzi out of the neighborhood," says a source.