Monaco's 2009 Rose Ball

Princess Caroline of Hanover, left, Prince Albert II of Monaco, and his girlfriend, Charlene Wittstock, arrive at the annual Rose Ball, Saturday, March 28, 2009, in Monaco. The theme of the ball this year was Rock 'N' Roll.

Rock 'n' roll legend Chuck Berry performed during the Rose Ball, Saturday, March 28, 2009, in Monaco. Berry is an influential figure in American music and one of the pioneers of rock and roll music. Joining the theme, Princess Caroline carried a motorcycle helmet filled with flowers.

The children of Princess Caroline of Hanover, Charlotte Casiraghi and Pierre Casiraghi, arrive togetjer at the Rose Ball, Saturday, March 28, 2009, in Monaco. The formal evening, which benefits the Princess Grace Foundation, marks the start of the Monaco social season.

Prince Albert II of Monaco and his girlfriend Charlene Wittstock dance at Rose Ball, Saturday, March 28, 2009, in Monaco Albert, started off the event with a dance with his older sister, Caroline.

American guitarist, singer and songwriter Chuck Berry is congratulated by Princess Caroline of Hanover after his performance at the annual Rose Ball, March 28, 2009, in Monaco.

British singer Shirley Bassey arrives at the Rose Ball, Saturday, March 28, 2009, in Monaco. Tickets for the charity event fetched $1,500.

Prince Albert II of Monaco, center, poses with his sister, Princess Caroline of Hanover, and German designer Karl Lagerfeld during the Rose Ball, Saturday, March 28, 2009, in Monaco. The Rose Ball was started in the 1950s by Princess Grace, who was the American actress Grace Kelly before her marriage.

Danish designer Isabell Kristensen arrives at the Rose Ball, Saturday, March 28, 2009, in Monaco.

Daughter of Princess Caroline of Hanover, Charlotte Casiraghi, attends to the Rose Ball, Saturday, March 28, 2009, in Monaco.

Prince Albert II of Monaco and his girlfriend, Charlene Wittstock, are cheek-to-cheek on the dance floor at the Rose Ball, Saturday, March 28, 2009, in Monaco.

Charlene Wittstock, girlfriend of Prince Albert II of Monaco, is photographed as she arrives at the Rose Ball, Saturday, March 28, 2009, in Monaco. A model and a former South African Olympic swimmer, Wittstock has been romantically linked with the prince since 2006.

Chuck Berry performs at the Rose Ball, Saturday, March 28, 2009, in Monaco.

Charlotte Casiraghi, daughter of Princess Caroline of Hanover, dances during the Rose Ball, Saturday, March 28, 2009, in Monaco.

Princess Caroline of Hanover, left, Prince Albert II of Monaco and his girlfriend, Charlene Wittstock, pose on stage at the annual Rose Ball, Saturday, March 28, 2009, in Monaco. After their mother's death in 1982, Albert and Caroline took over the charity ball and added annual themes.

German designer Karl Lagerfeld arrives at the Rose Ball, Saturday, March 28, 2009, in Monaco. The theme of the Rose Ball this year is Rock 'n' Roll

Swedish model Victoria Silvstedt attends the Rose Ball, Saturday, March 28, 2009, in Monaco.

Princess Caroline of Hanover is photographed at the Rose Ball, Saturday, March 28, 2009, in Monaco. She was not accompanied by her husband, Prince Ernst of Hanover, who is recovering from an injury.

Charlotte Casiraghi, daughter of Princess Caroline of Hanover, chats with friends at the Rose Ball, Saturday, March 28, 2009, in Monaco.

American guitarist, singer and songwriter Chuck Berry chats with Princess Caroline of Hanover after his performance at the Rose Ball Saturday, March 28, 2009, in Monaco.

Prince Albert of Monaco dances with girlfriend Charlene Wittstock during the Rose Ball, Saturday, March 28, 2009, in Monaco.