Dame Shirley put on an age-defying display on Saturday as she made an appearance at the ball in an eye-catching fluffy pink jacket, reports The Daily Mail.
The Welsh powerhouse stunned in a sparkling star-studded gown which she accessorised with a pair of silver earrings.
Bassey added to her glam ensemble with a swipe of shimmering eye-shadow and a red lip.
Princess Grace of Monaco created the Rose Ball in 1954 which is organised every year by the Monte-Carlo SBM group.
The event is held in the prestigious Salle des Etoiles restaurant in the Sporting Monte-Carlo.
Currently presided by Prince Albert II and Princess Caroline of Hanover, the Rose Ball is a symbol of glamour.
It brings together the elite and international high society from across the globe and the proceeds of the charity event go to the The Princess Grace Foundation.