The Queen of Pop has traded disco chic for middle-aged stylish, donning a simple and elegant red dress for the March cover of Harper’s Bazaar.

A transformed Madonna ’fesses up to her expensive tastes in the spring edition of the fashion bible, even admitting that pop stars can be a difficult to handle.

“What’s the difference between a pop star and a terrorist?” the 47- year-old quips. “You can negotiate with a terrorist.”

Madge, who posed in front of a background that matched her vivid red dress, also tells the magazine that when it comes to vacations, she and director husband Guy Richie often argue over how to spend their wads of cash.

“He loves the sea and fishing and being on a boat, outdoors, nature stuff,” she says.

“I’d rather go to India and check out all the temples or go to Bhutan. “We’ve had this discussion, and he’s got to start doing more of the holidays like I do.”

Madonna, who releases the second single, “Sorry,” from her “Confessions on a Dance Floor” album Monday, also says she is a big fan of expensive wine and champagne.

“I love Bordeaux,” she says. “I’m obsessed with drinking red wine.”