The Minneapolis Institute of Art's collection is chock-a-block with key works by Goya, Poussin, Girodet and others that museums worldwide regularly clamor to borrow. Any new artwork needs to be of top quality and have an impeccable pedigree to make the grade.

Which brings us to Alexander Roslin's portrait of "The Comtesse d'Egmont Pignatelli in Spanish Costume," the centerpiece of a small international show through Nov. 30. The museum bought the picture two years ago for $3.5 million and then promptly lent it to a major Roslin retrospective presented in Stockholm and Versailles, France.

The countess was the star of that exhibit, said Patrick Noon, the Minneapolis curator who organized the present show. In return, those museums and others in London and Edinburgh lent paintings to Minneapolis in honor of the picture's return to its new home.

"It's rare that you find a sitter with a story like this," said Noon. Besides the quality of the painting and the significance of the sitter, the 1763 portrait fills a gap in the museum's collection and it came with an impeccable provenance, or history of ownership. It had remained in the countess' family until the Minneapolis museum bought it through a New York dealer.

Although the show fills just one gallery, it is a sparkling affair that makes clear why a fetching 18th-century French countess can still turn heads.

THE COUNTESS

Famous for her beauty, charisma and intellect, Septimanie d'Egmont Pignatelli (1740-73) was educated in music, art, history, languages and literature at a Benedictine convent in Normandy. When she was 15, her father, the Duc de Richelieu -- a wealthy rake and powerful confidant of King Louis XV -- arranged her marriage to one of the richest young men at the court of Louis XV. She was welcomed into the diplomatic set at Versailles and the intellectual and artistic salons of Paris. She died childless at 33 of tuberculosis.

HER JEWELS

The famous "Pignatelli pearls" were a wedding gift from her husband, Casimir Pignatelli, Comte d'Egmont, an immensely wealthy aristocrat, army general and courtier. When he married Septimanie in 1755, he was 29 and a widower with a 5-year-old daughter. He outlived her by 28 years.

HER OUTFIT

Her fashionable "Spanish costume" was so called because of its raised collar, pearl swags and slashed and beribboned sleeves. Her guitar reinforced the painting's Spanish themes and honored her husband, a grandee of Spain who often entertained Spanish diplomats. Silver Spanish lace decorates the pillow under her arm.

HER POSE

It mimics that of her friend Madame de Pompadour -- the king's mistress -- in two famous portraits by François Boucher, including this one on loan from the Victoria and Albert Museum in London.

HER SETTING

It reflects the height of the neoclassical style, which was then replacing Rococo exuberance. The landscape signals her allegiance to the philosophy of her friend Jean-Jacques Rousseau, who championed the "natural" goodness inherent in people uncorrupted by society. It may also allude to her luxuriously rustic retreat in Picardy, the Château de Braisne.

HER POOCH

Dogs are a traditional symbol of loyalty. Her spaniel's failure to get Septimanie's attention suggests her refinement and sensitivity to literature. Really.

HER FRAME

Hand-carved and gilded, the frame was custom-designed for the portrait and is festooned with symbols of a happy marriage -- floral garlands, Cupid's bow and arrows, the torch and laurel wreath of Hymen.

HER FRIENDS

Besides the portrait of Pompadour at left, the show includes paintings of:

• Jean-Jacques Rousseau, the free-thinking Swiss philosopher and novelist who read aloud his scandalous "Confessions" at her country home.

• Sweden's young King Gustav III, with whom she exchanged witty letters about politics and society. Gustav was at the Paris Opera with Septimanie when he learned that his father had died and he was to be crowned king.

HER PAINTER

Alexander Roslin (1718 -1793), shown in a self-portrait that is part of the exhibit, was one of the most successful court painters of the 18th century. Born in Malmö, Sweden, he trained in Rome and worked for Catherine the Great of Russia, King Gustav III of Sweden and Stanislaus II of Poland as well as French royalty. An aristocrat to the core, he died quietly in his apartments in the Louvre palace six months after Louis XVI was beheaded in a nearby plaza.

Mary Abbe • 612-673-4431