3 March 2014
Last updated at 06:24 ET
American Hustle star Amy Adams was nominated for best actress, but was also rooting for Her - in which she also stars - in the best picture category. She said of her Gucci couture dress and Tiffany jewels: "It felt like me. It doesn’t always happen, so it's nice when it does."
Pregnant actress Olivia Wilde showed off her baby bump as she posed for fiance Jason Sudeikis on the Oscars red carpet, where he was presenting an award.
Anne Hathaway gave the Oscar for best supporting actor to Jared Leto. She wore a Gucci halter dress with a gem-covered front, with a sleek black split skirt.
Pharrell Williams, seen here with wife Helen Lasichanh, made a brave fashion choice for his moment on the red carpet, in this Lanvin tuxedo complete with shorts. He performed Happy at the ceremony, which features in Despicable Me 2 and was nominated for best song.
12 Years a Slave star Lupita Nyong'o was nominated for best supporting actress and won. Her Prada dress was made especially for her. "It is a blue that reminds me of Nairobi," she said. "I wanted to have a little bit of home."
Jared Leto - who was nominated for best supporting actor for his role in Dallas Buyers Club and won - took the lighter option for his Oscars suit. "I never really wear suits. It was just a fun opportunity to do something fun and classic," he said.
Fresh from her win at Saturday night's Independent Spirit Awards, Cate Blanchett hit the red carpet in a nude, beaded Giorgio Armani gown ahead of her best actress win. "It's heavy, but I love it," she said.
Jennifer Garner wore a silver, tulle tiered fringe gown covered in bead embroidery which was designed by Oscar de la Renta. The twenties-style dress was appropriate, as she presented the award for production design to The Great Gatsby. Her husband Ben Affleck wore a classic tuxedo.
Barkhad Abdi was among the first of this year's nominees to walk the red carpet. He featured in the best supporting actor category for his first ever film role, alongside Tom Hanks in Captain Phillips.
Sally Hawkins was nominated for best supporting actress for her role in Blue Jasmine. Dressed in Valentino, she joined Emma Watson and Kate Hudson on the red carpet who were both handing out awards.
12 Years a Slave star Chiwetel Ejiofor walked the carpet with his girlfriend Sari Mercer. He was up for best actor, one of the film's nine nominations.
Dressed in a red Dior peplum dress, best supporting actress nominee and American Hustle star Jennifer Lawrence laughed off another Oscars tumble, this time on her way in. Last year she famously tripped up on the stairs to the stage when collecting her best actress award for Silver Linings Playbook.
Charlize Theron, who presented an award at this year's ceremony, was the talk of the style commentators in this black Dior gown.
Lady Gaga left her usual outrageous red carpet outfits behind and wore a Versace dress that was classic Hollywood glamour
Like his Dallas Buyers Club co-star, Matthew McConaughey also chose a white tux for his big night, walking the carpet with his wife Camila Alves and his mum.
August: Osage County stars Meryl Streep and Julia Roberts, who wore Givenchy, were both nominated - in the best actress and supporting actress categories respectively.
Sandra Bullock, who wore an Alexander McQueen gown, was nominated for best actress for her role in Gravity. The film was up for 10 awards and ended up winning seven.
Brad Pitt and Angelina Jolie joked with photographers on the red carpet. The celebrity couple were among the last of the stars to arrive for this year's ceremony.