Michelle Obama's International Style: One the classy first ladies in history!

The First Lady updates her retro-chic wide-legged trousers with a citrine shell and nude belt, all by Zero + Maria Cornejo, while waving farewell to Santiago, Chile.

With outfits like this bright mousseline Sophie Theallet dress and Jordan Alexander earrings and pearls, which she wore to a state dinner in Chile, it's no surprise that Obama made Vanity Fair's best dressed list two years in a row.

No wonder they're called First Ladies: Obama and El Salvador's Vanda Pignato share top ranking when it comes to style in their color-coordinated purple frocks, which Mrs. O accessorizes with another Alexis Bittar pin.

She knows what she likes! Obama rocks yet another Alexis Bittar flower brooch – this time making it the standout accessory against her lacy lavender A-line dress for the President's speech in Chile.

Never one to shy away from color, the First Lady goes bold in a striped Marc by Marc Jacobs dress, coordinating yellow bag and Alexis Bittar bangles as she prepares to leave Brazil.

Obama continues to shine brightly in a gold jacquard L'Wren Scott dress and Miriam Haskell earrings as she raises a toast to her hosts in El Salvador's Casa Presidencial.

Her favorite cause is getting kids active, so it's no surprise the First Lady showed up to support a soccer team in Rio de Janeiro, Brazil – wearing a sporty-but-stylish vibrant printed skirt, yellow twinset and contrasting turquoise necklace.

"For me, fashion is fun," Obama has said – and she proves it by boogying down with a Capoeira group in Brazil in a one-shoulder watercolor print dress and Alexis Bittar wood and gold bangles.

Naeem Khan's golden gown was a huge hit at a 2009 state dinner, so it's no surprise that the First Lady revisits a similar look by the designer for a visit to Palácio da Alvorada in Brazil.

While disembarking Air Force One in Brazil with her family, Michelle Obama wears a sweetly summery red-and-black Tracy Reese dress – which happens to coordinate perfectly with her husband's sharp suit!