They have been separated for a few weeks now but they remain good friends, reported People magazine.
"Jennifer and Casper have split. They have not been together for a few weeks," a source said.
"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," the insider said.
The star, 47, was first romantically linked to 29-year-old Smart, her former backup dancer, in 2011 following her split from husband Marc Anthony. They have been in an on-and-off relationship since then.
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