Fellow catwalk stars Jourdan Dunn, Petra Nemcova, Alessandra Ambrosio and Georgina Rodriguez also looked pin-credible at the bash on the French Riviera.
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Heidi, 49, wore a green tasselled dress with a pair of shimmering silver heels.
Elsa, 34, was in a sheer number that left little to the imagination.
The Swedish model showcased her incredible figure in the outfit, which featured a low cut neckline and a cut out detail along the midriff.
Other celebs at the American Foundation for Aids Research event included actresses Kate Beckinsale and Eva Longoria, plus model Helena Christensen.
The bash was hosted by rapper-turned-actress Queen Latifah, 53.
As of last year, the annual gala had raised £220million for amfAR’s lifesaving research projects.
Guests enjoyed performances from music superstars including Adam Lambert and Gladys Knight at the glitzy party sponsored by Aston Martin.
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