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Jennifer Lopez and Casper Smart have called it quits.

E! News has learned the on-again, off-again couple's relationship has come to an end after nearly five years of dating. 

People was first to report the news, with a source telling the mag, "It wasn't anything dramatic and they were on good terms—it just came to a natural end. They will remain friends and they see each other, but they are not together. It was very amiable."

But not if you ask TMZ, who reports Smart's side is denying the breakup rumors. Even so, the outlet also cites insiders' close to the pop sensation that claim J.Lo initiated the split and they are indeed no longer together.

One thing's for sure: Lopez's rep isn't commenting. 

The "Ain't Your Mama" singer met the dancer-choreographer not long after she and husband Marc Anthony announced their split in 2011. Smart, 29, and Lopez, 47, went their separate ways for the first time in 2014 before later reuniting in May 2015. In the months leading up to their first reconciliation, both J.Lo and Casper adamantly denied they shared anything more than a friendship

Jennifer Lopez, Casper Smart, Golden Globe Awards Couples

Jason Merritt/Getty Images

As for the couple's recent movements, Casper attended Jennifer's August 13 performance in Sin City, and the pair posed alongside Anthony, who she co-parents 8-year-old twins Max and Emme with, and his wife Shannon De Lima.

He also celebrated Jennifer's birthday last month with a sweet Instagram tribute that read, "HAPPY BIRTHDAY to the light of my life. My supporter, rock, partner in crime and love. To the most beautiful bear in the world! I love you and wish you the Happiest birthday ever.."

Earlier this year, J. Lo addressed engagement speculation on Ryan Seacrest's KIIS-FM radio show, saying, "I'm not engaged and I didn't know there were rumors," Lopez said. "I've been so busy that I haven't really had time to keep up with the gossip."

But the singer, who is notoriously private when it comes to spilling details on her personal life, did tell the Today show she was open to tying the knot in what would be her fourth wedding ceremony.  "I love getting married," she said. "I really want to get married in a church with a big dress."

Smart gushed to E! News earlier this year about how Lopez has perfected the art of juggling a multi-faceted career. "Between [starring on Shades of Blue], [judging] American Idol and [a Las Vegas concert residency], it's bananas. She's not human. She's like supernatural. She's Wonder Woman, I'm telling you. She's not from this planet."