A reader of Kevin Kwan’s books could be forgiven for expecting him to make a grand entrance at lunch in Beverly Hills — in a Lamborghini, perhaps, or wearing a slick pair of shades.

Instead, on an unseasonably brisk Tuesday in April, Kwan walked into the private dining at Crustacean with a tentative tilt to his head, as if clearing a low roof. He wore tortoiseshell glasses, a blue cardigan and hair cut for maximum pensive tucking behind ears. Picture David Foster Wallace minus the bandanna.

Kwan immediately moved a vase of white roses from one table to another — “Do you mind? So we can see each other?” — then hugged Crustacean’s chef, “the great Helene An,” whose garlic noodles make a cameo in his new book, “Lies and Weddings,” coming out on May 21.

To understand Kwan’s reputation for fabulousness, consider his oeuvre. His debut novel, “Crazy Rich Asians,” published in 2013, has sold more than 5 million copies worldwide and been translated into over 40 languages. A Broadway musical is in development. The movie version was the first since “The Joy Luck Club” to feature a majority Asian cast.

Kwan’s next three novels covered similar territory: wealthy people behaving decadently and questionably, but usually with heart and always with panache. They were best sellers too. At one point, the “Crazy Rich Asians” trilogy occupied the top three spots on the paperback list, landing Kwan in an elite clique of authors including Colleen Hoover.