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Christina Aguilera looked absolutely gorgeous while stepping out in Monaco!

The Grammy-winning singer, 45, wore a plunging black gown while walking the red carpet at the 20th Anniversary Gala of the Prince Albert II of Monaco Foundation on Friday (September 18) at Opera Garnier in Monaco.

Christina joined a handful of other celebrities to help Prince Albert and Princess Charlene celebrate the foundation’s milestone.

Christina was one of the musical acts for the gala, alongside Placido Domingo and Sister Sledge.

Richard Gere and Monica Bellucci were both guests of honor for the gala.

More celebs in attendance included actress Isabelle Huppert and model Eva Herzigova.

The Prince Albert II of Monaco Foundation is a global non-profit organization committed to progressing Planetary Health for present and future generations.

Created in 2006, the foundation “focuses its action on three main principal fields — climate change, biodiversity and water resources — with particular attention to the Mediterranean Basin, the Polar Regions and the Least Developed Countries. To date, the Foundation has supported over 830 projects worldwide, contributing to the development of solutions that strengthen the resilience of ecosystems and communities.”

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