The royal was photographed on the red carpet with his sister Princess Caroline of Hanover, actress Sharon Stone and Orlando Bloom. Caroline, Princess of Hanover is the eldest child of Rainier III, Prince of Monaco and Grace Kelly.
Prince Albert was also joined by other relatives at the event including Charlene’s brother, Gareth Wittstock, his niece Pauline Ducruet and nephew, Andrew Casiraghi.
The event was hosted by Prince Albert II of Monaco Foundation and brought together scientists and philanthropists to bridge the gap between the environment and health.
The event included an auction with art and collectables with the money raised going towards the Foundation’s initiatives to tackle climate change.
However, Princess Charlene was not able to attend the event.
Instead, she thanked the foundation for “a successful and magical moment” on her Instagram page.
The Princess travelled to South Africa in Mid-May and became unwell during a conservation mission where she contracted an ear, nose and throat infection, preventing her from travelling.
Charlene is not expected to make a return to Monaco until October after she underwent a four-hour operation under general anaesthesia.
As Princess Charlene’s condition kept her in South Africa, the royal missed the 2021 Monaco Grand Prix and the tenth anniversary of her marriage.
READ MORE: Prince Albert debunks rumours over Charlene’s ‘exile’ in South Africa
The Princess is also a former Olympic swimmer who has previously represented South Africa at the 2000 Sydney Olympics but retired from sport in 2007.
The Princess met her future husband in 2000 at the Mare Nostrum swimming meet in Monaco.
She gave birth to twins Princess Gabriella and Jacques, Hereditary Prince of Monaco in 2014.