Just days following Jennifer Lopez's reported split from Casper Smart, the Puerto Rican beauty sends her former boyfriend a cryptic message on Instagram.

Taken on the set of her TV show Shades of Blue, the 47-year-old wears a black pantsuit while standing over street art that reads, "Protect Yo Heart" in the very telling photo.

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She then followed up the post with a photo of herself and ex-husband Marc Anthony performing together, writing, "Always fun sharing the stage w this one."

Life & Style previously reported that the couple's relationship had hit an all-time low, and the "Ain't Your Mama" singer's friendship with her ex could be to blame.

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"Casper’s jealous that J.Lo is still friends with Marc,” a source says.

For a look back at Jennifer and Casper's cutest moments, check out the gallery below!