He may not be Philippe de Montebello’s best friend, but Karl Lagerfeld has the rest of the art world in his thrall. Add Tuesday’s sale of his collection of Old Master paintings at Christie’s New York to the pile he netted in Monaco at April’s sale of his 18th-century French furniture and the total comes to a hefty $28.9 million. On Tuesday, Lagerfeld’s 142 Old Master paintings brought in $7.2 million; Pierre-Antoine Demachy’s “The Clearing of the Colonnade du Louvre and the Demolition of the Hotel Rouille,” which sold for $424,000, was the top lot.