Prince Albert II of Monaco and Princess Charlene Attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Prince Albert II of Monaco (L) and Princess Charlene arrive to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco arrives to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco arrives to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco arrives to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco arrives to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco arrives to attend the Monte-Carlo ATP Masters Series Tournament final tennis match between Spain and France, on April 17, 2016 in Monaco.

Princess Charlene of Monaco leaves after the final tennis match at the Monte-Carlo ATP Masters Series Tournament in Monaco on April 17, 2016

Prince Albert II of Monaco looks on during the presentations after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco congratulates winner Spain's Rafael Nadal during the awarding ceremony following the final tennis match at the Monte-Carlo ATP Masters Series Tournament in Monaco on April 17, 2016. Nadal defeated Monfils 7-5, 5-7, 6-0 to win a record ninth title at the Monte Carlo Masters.

Prince Albert II of Monaco congratulates winner Spain's Rafael Nadal during the awarding ceremony following the final tennis match at the Monte-Carlo ATP Masters Series Tournament in Monaco on April 17, 2016. Nadal defeated Monfils 7-5, 5-7, 6-0 to win a record ninth title at the Monte Carlo Masters.

Princess Charlene of Monaco attends the final match of the Monte-Carlo ATP Masters Series Tournament, on April 17, 2016 in Monaco.

Princess Charlene of Monaco attends the final match of the Monte-Carlo ATP Masters Series Tournament, on April 17, 2016 in Monaco

Prince Albert II of Monaco and Princess Charlene of Monaco applaud during the presentations after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco

Princess Charlene of Monaco applauds during the presentations after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco and Prince Albert II of Monaco attend the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Prince Albert II of Monaco and Princess Charlene of Monaco look on during the presentations after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

 Princess Charlene of Monaco applauds during the presentations after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco. 

Princess Charlene of Monaco leaves the trophy ceremony after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco leaves the trophy ceremony after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Prince Albert II of Monaco, Princess Charlene of Monaco and Elisabeth Anne de Massy applaud after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco and Prince Albert II of Monaco leave the trophy ceremony after the singles final match between Rafael Nadal of Spain and Gael Monfils of France during day eight of the Monte Carlo Rolex Masters at Monte-Carlo Sporting Club on April 17, 2016 in Monte-Carlo, Monaco.

 Prince Albert II of Monaco and Princess Charlene of Monaco attend the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco. 

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco. 

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco

 Prince Albert II of Monaco and Princess Charlene of Monaco attend the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco. 

 Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

 Prince Albert II of Monaco and Princess Charlene of Monaco attend the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

Rafael Nadal of Spain holds the trophy while Prince Albert II of Monaco and Princess Charlene of Monaco look on during the trophy presentation following the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

 Prince Albert II of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

 Princess Charlene of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.

 Prince Albert II of Monaco attends the final of the 2016 Monte-Carlo Rolex Masters at Monte-Carlo Country Club on April 17, 2016 in Monte-Carlo, Monaco.