Cameron & Justin Remain Professional

Former lovers Cameron Diaz and Justin Timberlake shared a kiss at the premiere of their new film. The 'Shrek 3' stars shared a "huge hug and kiss" at the US premiere in Los Angeles - their first public appearance together since splitting late last year.

A source said: "It was so heart-rending seeing them both back together. At first Cameron arrived and stayed closer to co-star Mike Myers than Justin.

"The crowd of fans outside were chanting both her and Justin's names and were urging them to walk along the green carpet together.

"They initially stayed apart and didn't make any eye-contact with each other.

"But later, when they went to a cast photoshoot, they couldn't stop smiling at each other and seemed very relaxed. They shared a huge hug and a kiss and whispered to each other, giggling."

After the screening, the 'In Her Shoes' actress and Justin reportedly had dinner at West Hollywood's Kou restaurant.

'SexyBack' singer Justin, 26, met and Cameron, 34, at the Nickelodeon Kids' Choice Awards in April 2003. They dated for three years before splitting in December. The pair issued a statement in January saying their separation was a mutual decision, and that they parted on good terms. Justin has recently been romantically linked with Scarlett Johansson and Jessica Biel.