Marc Anthony was "immediately smitten" with his new girlfriend Mariana Downing.

Marc Anthony

Marc Anthony

The 48-year-old musician finalised his divorce from 29-year-old Shannon De Lima on Monday (13.02.17) and the singer songwriter has already moved on from his former partner with the 21-year-old model who he was instantly taken by when they first met at a dinner party, according to TMZ.

Speaking about the dark-haired hunk's romance, a source said: "Marc was immediately smitten."

Marc - who has eight-year-old twins Max and Emme with his former partner Jennifer Lopez - reportedly asked Mariana for her number when they locked eyes on one another.

The 'You Sang To Me' hitmaker is believed to have called the brunette beauty the next day, and the pair are rumoured to have been inseparable ever since as they have recently enjoyed a luxurious vacation in the Caribbean together.

However, the couple have kept their romance under wraps as neither of them have posted anything about their love life or one another on any of their social media sites.

Although Marc's court documents regarding his and Shannon's separation were completed earlier this week, the pair first announced they had separated in November last year and filed for a divorce weeks later on December 16.

But their decision to call time on their romance was a mutual choice for the pair.

Speaking previously, they said in a statement: "After much consideration, we have mutually and amicably decided to end our two year marriage.

"We ask for privacy during this difficult process, and no further comments will be made from either one of us about this personal matter."

Meanwhile, Marc - who also has Cristian, 16, and Ryan, 13, with his previous spouse Dayanara Torres and 22-year-old Ariana with Debbie Rosado - admitted his biggest regret is not being a stay-at-home dad.

Speaking previously, he said: "The one regret would be that what I chose to do took so much of my time. What I would have done to have been a stay at home dad, and, you know, witnessed every second of everything. I would have loved that."