Kate Winslet looked as radiant as ever on Tuesday, when the 36-year-old arrived at the world premiere of Titanic 3D, held at the legendary Royal Albert Hall in London.

Wearing a gorgeous plunging black gown by Jenny Packman, complete with silver shoulder caps and a diamond clasp, the actress kept it classy on the red carpet. While her leading man on screen, Leonardo DiCaprio, was absent from the festivities, Winslet was joined by her real life leading man, Ned RockNRoll, nephew of Virgin mogul Richard Branson.

Titanic director James Cameron was on hand for the film's 3D re-release, as was the blockbuster's famous villain Cal, played by Billy Zane.

Earlier this week, Cameron made headlines when he took an epic dive to the bottom of the deepest part of the world - the Mariana Trench in the western Pacific Ocean. The solo dive has made Cameron quite the star (even though he's already the king of the world thanks to his blockbuster films). The 57-year-old director is the first to visit the Mariana Trench (which is more than 35,000 feet deep) in more than 50 years.

Titanic 3D employed some 300 production artists who spent more than 60 weeks changing the film to 3D.

It just felt right in the centenary of the sinking of the Titanic to bring this back out for the fans who either are fans of the movie but have never had the widescreen experience or are fans of the movie who remember it from back then and want to re-experience that, Cameron told The Telegraph in December.

Released in 1997, the original Titanic earned Cameron and company 11 Oscars, including Best Picture and Best Director. The film brought its two leads instant fame, making DiCaprio a heartthrob among millions of fans around the world and Winslet an actress on everyone's must-hire list, despite her young age (she was 21 when she made the movie). To date, Titanic is the second highest-grossing film of all time, with more than $1.8 billion in worldwide gross, right behind Cameron's other blockbuster, Avatar ($2.7 billion).

Titanic 3D arrives in theaters Apr. 4, just in time to commemorate the 100th anniversary of the sinking of the RMS Titanic on Apr. 15, 1912.

Click through for photos from the world premiere of Titanic 3D.

Kate Winslet
Actress Kate Winslet poses for photographers as she arrives at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS
James Cameron Arrives for Titanic 3-D Launch after Deep Ocean Exploration
Actress Kate Winslet poses for photographers as she arrives at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS
Kate Winslet
Actress Kate Winslet signs autographs for fans as she arrives at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS
James Cameron Arrives for Titanic 3-D Launch after Deep Ocean Exploration
Actress Kate Winslet poses for photographers as she arrives at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS
James Cameron Arrives for Titanic 3-D Launch after Deep Ocean Exploration
Actress Kate Winslet poses for photographers as she arrives at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS
James Cameron, Suzy Amis
Director James Cameron and his wife Suzy Amis pose for photographers as they arrive at the world premiere of "Titanic 3D" at the Royal Albert Hall in London March 27, 2012. REUTERS