A shimmering Michelle Williams cuts a lone figure on the red carpet at Cannes

Promoting her new film "Synecdoche New York", the actress laughed alongside Philip Seymour Hoffman, Catherine Keener and Samantha Morton.

Despite the tragic death of her ex-fiance, Michelle has looked nothing but flawless since she arrived in Cannes.

Last night, in her first major public appearance since the death of Heath Ledger in January, Williams lit up the red carpet as she attended the premiere of her new film Wendy And Lucy.

Wearing a gorgeous white gown with shoulder lace trim, Williams looked gorgeous as she smiled and posed for photographers, weeks after the death of her former flame.

The film is set around a woman's adventures after she breaks down and faces a series of challenges while driving with her dog Lucy to Alaska.

Michelle Williams arrives for the premiere of Wendy And Lucy at Cannes last night in her first major public appearance since the death of Heath Ledger in January

Ledger, who was found dead in his New York apartment in January,  died from an accidental overdose of prescription medication.

Although the couple had separated at the time of his death, Williams was left  "devasted" over the tragedy.

The couple began dating while filming Brokeback Mountain, and their daughter Matilda Rose was born in October 2005.

The star shared a joke with co-stars Samantha Morton, Philip Seymour-Hoffman and Catherine Keener

In her first public statement on the death in February, she expressed her heartbreak and described her seeing Ledger's spirit surviving in their daughter.

"I am the mother of the most tender-hearted, high-spirited, beautiful little girl who is the spitting image of her father," she revealed.

"All that I can cling to is his presence inside her that reveals itself every day," she said.

Michelle Williams was the epitome of elegance promoting her new film in Cannes

"His family and I watch Matilda as she whispers to trees, hugs animals, and takes steps two at a time, and we know that he is with us still.

"She will be brought up in the best memories of him."

The couple had moved to New York in 2005 and were raising Matilda 
before his death and the break up of their relationship.

Williams was 'devastated' over Ledger's death and spoke of her sadness at raising their daughter, Matilda, alone