She's known for her little black dresses, but when it comes to the Oscars, she put out all the stops.

Jennifer Aniston was glowing in a red Valentino gown as she walked hand in hand with her fiance Justin Theroux at the 85th Academy Awards in Hollywood on Sunday.

The svelte star couldn't keep back the smiles as she walked alongside her main squeeze in a tight bodice and full skirted gown that accentuated her flawless figure.

The 43-year-old paired her trademark pin-straight straight blonde locks with light make-up and luscious lashes.

The Wanderlust actress will join her co-star Paul Rudd on stage as a presenter, ending her four year break from attending the show.