The couple, who have been married for five-and-a-half years, have recently faced speculation that their marriage is on the rocks after not being photographed together for 107 days.
But the picture of Mariah and her 33-year-old hubby reveals the pair in a romantic clinch, with the rapper's arms wrapped tightly around his wife's waist.
Mariah, looking glamorous in a cream gown with sequinned detail, looks as loved up as ever as she smiles delightedly for the camera.
Nick captioned the symbolic black and white photo, "My #WCW," which stands for "Woman Crush Wednesday."
The proud dad – the couple have two-year-old twins Moroccan and Monroe together – also showed that he has eyes for two ladies, posting an adorable snap of his wife cuddling up to his daughter Monroe, who was sucking on a pink dummy.
"#WCW" wrote the America's Got Talent judge.
The pair's united front comes after Mariah's absence at the 2013 TeenNick Halo Awards on Sunday, and RadarOnline's suggestion that Nick was neglecting his wife in order to put his career first.
Mariah recently revealed that the first year of their marriage "was the easiest". In an interview with radio station Hot 97, the star went on to say, "And then he started doing America's Got Talent so he just works constantly."
Nick has been spending most of his time in Los Angeles, where the TV talent show is based, while Glitter star Mariah has been increasingly spending her time in New York.