Wikipedia has an own section for the wedding. The link is here
en.wikipedia.org/wiki/Wedding_of_Albert_II,_Prince_of_Monaco,_and_Charlene_Wittstock
I found 178 names on the list of guests. ;D
Guests
The guest list consists of reigning and non-reigning royalty, other heads of state and government, ambassadors to Monaco from various countries, businessmen, entertainers, fashion designers, models, and sportspersons.The following is a list of notable guests who attended the religious ceremony:
Monegasque Princely FamilyHRH The Princess of Hanover
Andrea Casiraghi
Charlotte Casiraghi
Pierre Casiraghi
HRH Princess Alexandra of Hanover
HSH Princess Stéphanie of Monaco
Louis Ducruet
Pauline Ducruet
Camille Marie Kelly Gottlieb
Wittstock FamilyMichael Wittstock (father of the bride)
Lynette Wittstock (mother of the bride)
Gareth Wittstock (younger brother of the bride)
Sean Wittstock (youngest brother of the bride)
RoyaltyHRH The Crown Prince of Bahrain
TM The King and Queen of the Belgians
TRH The Duke and Duchess of Brabant
TIRH Princess Astrid and Prince Lorenz of Belgium, Archduke of Austria-Este
TRH Prince Laurent and Princess Claire of Belgium
TRH The Crown Prince and Crown Princess of Denmark
TRH Prince Joachim and Princess Marie of Denmark
TRH Prince Faisal bin Al Hussein of Jordan and Princess Sara Faisal of Jordan
HM The King of Lesotho
HRH The Hereditary Prince and Hereditary Princess of Liechtenstein
HRH The Grand Duke and Grand Duchess of Luxembourg
HRH The Hereditary Grand Duke of Luxembourg
HRH Princess Lalla Meryem of Morocco
Lalla Soukaïna Filali
TRH The Prince of Orange and Princess Máxima of the Netherlands
TRH The Crown Prince and Crown Princess of Norway
TM The King and Queen of Sweden
TRH The Crown Princess of Sweden and the Duke of Västergötland
HRH Princess Madeleine of Sweden
HRH Prince Carl Philip of Sweden
HRH Princess Sirivannavari Nariratana of Thailand
TRH The Earl and Countess of Wessex
TRH Prince Michael and Princess Michael of Kent
Non-reigning royaltyHH The Aga Khan IV
TRH The Duke and Duchess of Anjou
HRH The Margrave and HI&RH Margravine of Baden
TRH The Hereditary Prince and Hereditary Princess of Baden
HM King Leruo Molotlegi of Bafokeng
TRH Prince Leopold and Princess Ursula of Bavaria
TRH The Duke and Duchess of Braganza
TRH The Duke and Duchess of Castro
HSH Princess Virginia of Fürstenberg
HRH The Hereditary Prince of Hanover
HRH Prince Christian of Hanover
HIM The Empress of Iran
HRH The Prince and Princess of Naples
TRH The Prince and Princess of Venice and Piedmont
TRH Prince Henri and Princess Micaela of Orléans, Count and Countess of Paris
HI&RH The Prince of Prussia and HSH Princess Sophie Johanna Maria of Isenburg
TRH Princess Margarita and Prince Radu of Romania
HIH Grand Duchess Maria Vladimirovna of Russia
HIH Grand Duke George Mikhailovich of Russia
TRH The Crown Prince and Crown Princess of Yugoslavia
Government and diplomacyHE George Abela (President of Malta)
HE Salma Ahmed (Ambassador of Kenya to Monaco and France)
HE Angelino Alfano (Minister of Justice of Italy)
HE Maria Luisa Berti (shared Captain Regent of San Marino)
HE Constantin Chalastanis (Ambassador of Greece to Monaco and France)
HE Mirko Galic (Ambassador of Croatia to Monaco and France)
HE Ólafur Ragnar Grímsson (President of Iceland)
HE Kornelios Korneliou (Ambassador of Cyprus to Monaco and France)
HE Ulrich Lehner (Ambassador of Switzerland to Monaco and France)
HE Marc Lortie (Ambassador of Canada to Monaco and France)
HE Lejeune Mbella Mbella (Ambassador of Cameroon to Monaco and France)
HE Mary McAleese (President of Ireland)
HE Tomasz Orlowski (Ambassador of Poland to Monaco and France)
HE Jeff Radebe (Minister of Justice and Constitutional Development of South Africa)
HE Charles Rivkin (Ambassador of the United States to Monaco and France)
HE Nicolas Sarkozy (President of the French Republic)
HE Missoum Sbih (Ambassador of Algeria to Monaco and France)
HE Marthinus Van Schalkwyk (Minister of Tourism of South Africa)
HE Pál Schmitt (President of Hungary)
HE Veronika Stabej (Ambassador of Slovenia to Monaco and France)
HE Michel Suleiman (President of Lebanon)
HE Filippo Tamagnini (shared Captain Regent of San Marino)
HE Dr. Karlheinz Töchterle (Minister for Science and Research of Austria)
HE Viraphand Vacharathit (Ambassador of Thailand to Monaco and France)
HE Christian Wulff (Federal President of Germany)
Sports personalitiesGerhard Berger (former Formula One racing driver)
Jonas Björkman (former World Number 4 professional tennis player)
Sergey Bubka (retired pole vaulter)
Nadia Comăneci (gymnast)
Charmaine Crooks (athlete)
Bob Ctvrtlik (volleyball player)
Sophie Edington (backstroke and freestyle swimmer)
Patrice Evra (international footballer)
Frankie Fredericks (former athlete)
Graham Hill (swimming coach and former competitive swimmer)
Jacky Ickx (former racing driver) and Khadja Nin
Branislav Ivkovic (swimming coach, who trained Charlene Wittstock ahead of the 2008 Beijing Olympics)
Byron Kelleher (rugby union half-back)
Henri Leconte (former professional tennis player)
Axel Lund Svindal (World Cup alpine ski racer)
Julia Mancuso (alpine ski racer)
Ian McIntosh (rugby union coach)
Elana Meyer (former long-distance runner)
Ilie Năstase (former professional tennis player)
Ryk Neethling (swimmer)
Terence Parkin (deaf swimmer)
François Pienaar (former rugby player)
Nicola Pietrangeli (former tennis player)
Sarah Poewe (professional swimmer)
Wayne Riddin (swimming coach and former competitive swimmer)
Count Jacques Rogge (President of the International Olympic Committee)
Roland Schoeman (swimmer)
Sir Jackie Stewart (former racing driver and team owner)
Jean Todt (President of the FIA) and Michelle Yeoh
Franziska Van Almsick (swimmer)
Pernilla Wiberg (alpine ski racer, IOC member)
Fashion industryGiorgio Armani
Terrence Bray
Naomi Campbell
Roberto Cavalli
Inès de La Fressange
Sébastien Jondeau
Isabell Kristensen
Karolína Kurková
Tereza Maxová
Karl Lagerfeld
Celebrities and othersBernard Arnault and Hélène Mercier-Arnault
Dame Shirley Bassey
Andrea Bocelli (tenor, multi-instrumentalist and classical crossover artist)
Gerard Butler (actor)
Bernadette Chirac
Bernice Coppieters (ballet artist and member of the Les Ballets de Monte Carlo)
Donna D’Cruz (DJ and model)
Renée Fleming
Francisco Flores Pérez (President of El Salvador between 1999 and 2004)
Juan Diego Flórez (opera tenor)
Mel Gibson
Jean-Christophe Maillot (dancer and choreographer)
Jean-Michel Jarre (musician)
Pumeza Matshikiza (lyric soprano)
Demi Moore and Ashton Kutcher
Sir Roger Moore and Lady Moore
Guy Laliberté (Canadian entrepreneur, philanthropist, poker player, space tourist and CEO of Cirque du Soleil)
Yves Piaget (Swiss watch-maker and President of Piaget SA)
Eric Peugeot (French marketing engineer)
Bertrand Piccard
Johann Rupert (South African businessman and chairman of Richemont, VenFin and Remgro)
Eric Sempe (French guitarist)
Sonu Shivdasani (Chairman and CEO of the Six Senses group)
Victoria Silvstedt (celebrity, model, actress, singer, and television personality)
Sir Michael Smurfit
Pierre Casiraghi, son of Caroline, Princess of Hanover and Stefano Casiraghi, with his girlfriend Beatrice Borromeo
Umberto Tozzi (pop/rock singer and composer)
Best man and maid of honourBest man: Chris Levine (cousin of the groom, son of Princess Grace's sister Lizanne)
Maid of honour: Donatella Knecht de Massy (wife of the groom's first cousin once removed, Keith Sebastien Knecht de Massy)