Jennifer Lopez and Marc Anthony renewed their wedding vows "on the spur of the moment" Sunday morning.

The singer-and-actress and her singer spouse decided to reaffirm their love for each other following a night out with friends New York Mets outfielder Carlos Beltran and his wife Jessica, who also renewed their vows at Las Vegas' Caesars Palace's Forum Tower Penthouse.

A source revealed: "It was totally a spur of the moment thing. They decided around 12:30 in the morning that they wanted to do it and started calling for ministers."

"Carlos gave his wife a specially engraved ring and gave Marc and Jennifer special rings as gifts. Carlos and Jessica renewed their vows first, then Jennifer and Marc went."

The decision came after the foursome enjoyed a private dinner at Bradley Ogden followed by some time in the casino.

The source added to People magazine: "They were both winning at the craps table and Marc kept saying that it was going to be a lucky night. It was nearly flawless."

"Initially, they were supposed to do the ceremony outside on the suite's balcony but it was too cold, so they had to move it inside. That was the only thing that didn't go according to plan."

"Marc actually said the suite was so beautiful that it deserved it's own zip code. He thought it was perfect."

Wearing a black dress, Jennifer - who has been married to Marc for four years - looked "beautiful" for the ceremony which was conducted in front of 12 witnesses.

However, Jennifer - who gave birth to twins Max and Emme in January - was not joined by her close family.

The source explained: "Her parents didn't even see it because they were with the babies."

Following the ceremony, which took place at around 3:15 a.m., the couples celebrated with a bottle of Dom Perignon champagne.

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