Cannes 2012: Reese Witherspoon at Mud premiere with Matthew McConaughey

PUBLISHED: 13:54 EST, 26 May 2012 | UPDATED: 14:42 EST, 26 May 2012

She's in her second trimester but that didn't stop Reese Witherspoon looking stylish as she stepped out on the red carpet at the premiere of her movie Mud in Cannes today.

The Oscar winner was positively glowing in a sapphire blue gown with a sexy cut out back, showing that although she may be pregnant, she has no plans to ditch her glamorous look for frumpy outfits.

While the gruelling 14 hour long-haul flight from Los Angeles to France would take its toll on most people, Reese, 36, showed no sign of fatigue as she laughed and joked with co-star Matthew McConaughey in front of the world's press.

SCROLL DOWN FOR VIDEO...

Not long now: Reese Witherspoon stepped out onto the red carpet at tonight's premiere of Mud in a dazzling blue gown that showed off her growing baby bump

Sexy mama! Pregnant Reese wasn't afraid to flash the flesh in a stunning blue gown as she posed for the world's press with Mud co-star Matthew McConaughey

The actress was also happy to sport skyscraper heels to go with her gorgeous gown, showing she had chosen style over comfort for the glamorous occasion.

She paired diamond drop earrings, a matching bracelet and her stunning wedding ring with the full length dress for full on glamour.

Glowing! Reese and co-star Matthew were in high spirits as they walked the red carpet at Cannes

At a photocall for the movie earlier in the day with co-stars Matthew McConaughey, Jacob Lofland and Tye Sheridan, the mother-of-two showed showcased her growing bump in a little black dress.

Ever obliging, when the world's photographers shouted at her to stand up so they could see her belly in all its glory as she went to sit down, Reese duly showed off her growing figure.

She also admitted her pregnancy wasn't slowing her down, telling Us Weekly magazine: 'The flight over was actually pretty good. I feel great.

'I'm excited about showing the movie. The energy here is great.'

Hard at work: Reese poses with Mud director Jeff Nichols and co-stars Jacob Lofland, Tye Sheridan and Matthew McConaughey at the movie's premiere in Cannes

After flying into nearby Nice airport on Thursday, Witherspoon and her husband Jim Toth quietly attended the latter part of the dinner for Nicole Kidman's new film The Paperboy.

Mud is a drama about two teenage boys who encounter a fugitive and decide to help hide him from the bounty hunters seeking him and to reunite him with his true love (Witherspoon).

The film's writer and director Jeff Nichols hailed Witherspoon for her small role in the movie.

Sexy slit! Reese showed she doesn't plan to ditch the glamour just because she is pregnant as she and co-star Matthew walked the red carpet

Sexy split! Reese showed she isn't ready to ditch the glamour just because she is pregnant as she stepped out on the red carpet with co-star Matthew

He said: 'I needed Reese Witherspoon. Even if her screen time is limited and, bless her heart, I kept her in a motel room most of the time, she still managed to look good. And you have this man (McConaughey) talking about her the whole time.

'I needed someone who, when she showed up, it was like SHE'S HERE!. She had to be believable and stand out at the same time.'

The look of love: It was date night on the red carpet at the Mud premiere as Sting took along wife Trudie Styler while Alec Baldwin and fiancee Hilaria Thompson were equally loved up

What were you thinking? Bonnie Wright (left) fails to impress in casual dress and flat shoes on the red carpet but Andie McDowell (right) stood out for all the right reasons

Witherspoon and husband Toth - who she wed in March 2011 after a one year courtship - are expecting their first child together in the autumn. She already has two children Ava and Deacon from her previous marriage to Ryan Phillippe.

Blooming lovely: Reese Witherspoon shows off her baby bump in a black ruched jersey dress at the Mud photocall at the Cannes Film Festival