Jennifer Lopez left fans cringing after she fawned over her husband during a concert on Tuesday night. The 'Jenny from the Block' singer performed to a crowd of just 500 at New York's Spotlight Live venue to promote her first Spanish-language album 'Como Ama Una Mujer (How a Woman Loves)' and was joined on stage by her husband Marc Anthony. Jennifer thanked the crowd, which included her mother and sister, for coming and was interrupted by a call of "I think you're so cute" from the audience. Jennifer replied: "And my husband is here."After her first song the 37-year-old said: "The next song is a little treat. In a second you'll see why."She was joined on stage by Marc, 38, and they performed a romantic duet during which he pulled her into an embrace and they gazed into each other's eyes.When the song ended Jennifer said: "How you like them apples? That's my baby, for better or for worse!"After the concert the couple partied in the VIP area, drinking champagne and feasting on giant puffs of pink cotton candy, marbled "monkey bar" brownies, chocolate-dipped donuts and milk shakes in shot glasses. A source told People magazine: "They stayed close and whispered to each other."When Justin Timberlake's 'SexyBack' came on, Jennifer threw her glass up and shook her famous booty with her hand on Marc's shoulder."The couple - who married in 2004 and filmed a movie together last year -left at midnight, hand in hand.