Jennifer Aniston Headed to the Academy Awards

The actress will be among the presenters on Sunday at the Oscars, but will John Mayer be with her on the big night?

Jennifer Aniston will be at the Oscars!

I can exclusively reveal that Ms. Aniston will present an award on Sunday night with funnyman Jack Black.

Whether she and boyfriend John Mayer walk the red carpet together remains a mystery.

Mayer told Popsugar earlier this week that he planned to attend the awards, which take place at the Kodak Theater in Hollywood. “It’s my first Oscars,” the singer said. “And it’s my first being an Oscar boyfriend.”

The big night could also mean the first run-in Aniston has ever had with Brad Pitt and Angelina Jolie, both of whom are nominees.

Aniston’s rep did not immediately comment.

Aniston was not with Mayer tonight, at least not while she enjoyed dinner with three friends during another Grey Goose night at Cecconi’s restaurant in West Hollywood.

A table away from the former Friends star was Gwen Stefani and hubby Gavin Rossdale with a gaggle of pals, including American Idol creator Simon Fuller. In the back of the eatery, Mariah Carey and Nick Cannon joined a large group of people, including Laurence Fishburne and NBC honcho Ben Silverman.

Among the other restaurant-goers were Elle Macpherson, Bradley Cooper, Fisher Stevens, Elizabeth Banks, Jason Bateman, fashion designer Ozwald Boateng and Los Angeles Mayor Antonio Villaraigosa.

Across town, nominee Anne Hathaway revealed that she has her Oscar dress picked out. “She said she ‘is in love with it,’” said a fellow partygoer at Perrier-Jouët champagne’s Women in Film cocktail soiree at Peter and Tara Guber’s house. “She said it’s a little out of her comfort level but hopes people love it as much as she does!”

Over at the Paramount Studios lot, Reese Witherspoon, Marcia Cross, Eva Longoria, Andie MacDowell, Helen Hunt, Lauren Hutton, Milla Jovovich, Jessica Lange, Christina Ricci, Susan Sarandon, Mira Sorvino, Lucy Liu, Joan Collins, Dita Von Teese and Rosanna Arquette hit the Montblanc Signature for Good-UNICEF event.

Sienna Miller told us she can’t wait to make her Broadway debut when she stars in After Miss Julie at the Roundabout Theatre Company. “I'm so excited!” the British starlet said. “I'm nervous!”

Previews of playwright Patrick Marber's take on a 19th- century Strindberg classic about class, sex and power opens in October. Miller will play a wealthy young woman having an affair with a servant.

—Additional reporting by Dahvi Shira