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Actress Demi Moore and husband actor Ashton Kutcher, seen at a lUnited Nations even in New York on Nov. 4, 2010, are friends of Monaco's ruler Prince Albert II and were guests at Charlene Wittstock's bridal shower in New York.
Supermodel Naomi Campbell, an old flame of Prince Albert's is reportedly on the guest list for the royal wedding. She is pictured here at "The Beaver" premiere during the 64th Cannes Film Festival on May 17, 2011, in France.
And speaking of "The Beaver," its star Mel Gibson, seen here with director Jodie Foster at the Cannes Film Festival on May 17, 2011, is also reported to be among the guests. He and the prince are friendly and even spent time together during the film festival last month.
British actor Roger Moore, one of the actors who played James Bond, the fictional Agent 007, is also on the wedding guest list. Here is pictured in a 2008 photo.
Model Karolina Kurkova arrives for the amfAR Cinema Against AIDS benefit at the Hotel du Cap-Eden-Roc, during the 64th Cannes Film Festival, in Cap d'Antibes, southern France, May 19, 2011. The supermodel also is expected at the royal wedding.
France's President Nicolas Sarkozy and first lady Carla Bruni-Sarkozy are on the guest list along with other heads of state. Bruni-Sarkozy is expecting the couple's first child.
Fashion designer Karl Lagerfeld acknowledges applause at the end of his Spring/Summer 2011 ready to wear collection for Chanel, presented in the Grand Palais Museum during Paris Fashion Week, Oct. 5, 2010, in Paris. Lagerfeld, who often designs for Prince Albert's older sister, Princess Caroline of Hanover, is expected to be a wedding guest.
Sophie, Countess of Wessex, and Britain's Prince Edward lwill represent the UK royals at the nuptials. They ar epictured here at their own wedding in Windsor, England, on June 19, 1999.
A newlywed herself, Sweden's Crown Princess Victoria and husband Prince Daniel, Duke of Vastergotland, will be in Monaco for the festivities. Here the couple waves to spectators from a balcony at the Royal Palace after their wedding in Storkyrkan Church on June 19, 2010, in Stockholm.
Swedish King Carl XVI Gustaf, right, and Queen Silvia, left, seen here at the 2007 Nobel gala at Royal Palace in Stockholm, will be wedding guests.
Princess Madeleine of Sweden arrives to attend the wedding banquet for Crown Princess Victoria of Sweden and her husband, Prince Daniel, at the Royal Palace on June 19, 2010, in Stockholm.
She will be in Monaco, too, next month.
Prince Carl Philip of Sweden took the top spot on the men's list of most beautiful royals, is expected to be a wedding guest. H eis seen here during the Nobel Foundation Prize Awards Ceremony on Dec. 10, 2009, in Stockholm.
Spanish Crown Prince Felipe de Bourbon waves as he and his bride Letizia appear on the balcony of the royal palace after their wedding ceremony May 22, 2004, in Madrid. Both will be in the Palace courtyard when Monaco's Prince Albert takes his vows.
Princess Caroline of Monaco waves to spectators as she arrives at Madrid's Almudena Cathedral to attend Spanish Crown Prince Felipe of Bourbon's wedding to former TV presenter Letizia Ortiz on May 22, 2004. She is Prince Albert' s sister.
Pierre Casiraghi, son of Princess Caroline of Hanover and Monaco, is seen with his sister Charlotte Casiraghi at the Rose Ball, March 28, 2009 in Monaco. They are Prince Albert's niece and nephew.
Princess Caroline of Hanover and Monaco and her daughter Alexandra arrive at the "Croisiere" collection show with creations by German fashion designer Karl Lagerfield in Antibes, southeastern France on May 18, 2011. You can bet they'll be at the wedding.
Andrea Casiraghi, the son of Caroline, Princess of Hanover and Monaco (and grandson of Princess Grace), came in second place on the men's list for hottest royals. His sister, Charlotte, was ranked fifth on the women's list. He is Prince Albert's nephew.
Princess Stephanie of Monaco poses with a seal as she presents the 34th Monte-Carlo International Circus Festival in Monaco, Tuesday, Jan. 12, 2010. She is Prince Albert's younger sister.