The Material Girl and boyfriend Brahim Zaibat were sat at their table at Manhattan's Osteria Cotta when the superstar pulled out a bottle of red wine and crystal glasses from her bag.
'She brought her own red wine in a bag, along with two beautiful crystal glasses. They poured the wine and immediately put the bottle back in the bag, so nobody could see what it was,' a diner told the New York Post.
'At the end, they took the empty wine bottle and the glasses with them.
'We couldn’t figure out if Madonna prefers specific wine, or is a total germaphobe.”
Madonna's rep didn’t respond.