The American Idol judge, who has tied the knot three times, stepped out looking hotter than ever shortly after Marc's wedding news was leaked.
J-Lo made an appearance on the Late Show with David Letterman in a gorgeous black cape with matching trousers and a wrap crop top which showed off her toned midriff.
The 45-year-old has remained close to her former husband, who reportedly proposed to his girlfriend, model Shannon De Lima, back in March.
According to Us Weekly, the happy couple, who have been dating on and off for two years, are expected to marry later this month in the Dominican Republic.
Meanwhile Jennifer has been single since splitting from dancer Casper Smart earlier this year and feels that it's important for her to get to know herself.
"It was work for me to finally go … I need to be on my own," she told the Huffington Post.
"That's not a place that's comfortable for me, but that's something that I need to do so that I know I'm okay on my own, that I can handle this, that I got this… I want somebody else, that would be nice, but I gotta be happy and whole on my own first."
Jennifer is currently promoting her first book True Love, in which she talks about some of the most difficult times in her life, including the breakdown of her marriage to Marc.
She filed for divorce from the 'I Need To Know' singer, who is father to her six-year-old twins Max and Emme, in 2012 after nearly seven years of marriage.