Jenna Dewan's Fiancé Posts Mocking Laughter After Channing Tatum Split

11:31 AM PT -- Jenna Dewan's fiancé, Steve Kazee, is clarifying his cryptic laughing post he shared in the aftermath of Channing Tatum and Zoë Kravitz's split ... defending his upload had nothing to do with JD's ex.

Steve posted on his Instagram Stories Wednesday amid the growing controversy ... explaining he was simply laughing about his houseplants.

He wrote ... "A guy can't laugh about a houseplant on Tik Tok in todays [sic] world I see ..."

SK then shared photos and videos of the various dead plants placed throughout his home ... including one that sat next to his water filter.

Looks like Jenna Dewan's fiancé, Steve Kazee, is having one hell of a chuckle -- dropping a very telling message right after Channing Tatum and Zoë Kravitz called it quits.

Soon after the breakup news dropped Tuesday, Steve shared a post on his IG Story with "HAHAHAHA" plastered repeatedly in big white letters on a black screen, filling the page -- clearly signaling he found something absolutely hilarious.

Of course, we can’t say for sure if Steve was stirring the pot and throwing shade at Channing ... but the timing of the post definitely raises some eyebrows.

Steve stood by Jenna's side through her messy divorce from Channing, witnessing everything firsthand -- like when Channing accused her of dragging things out by wanting multiple trials instead of just one. So, you can bet Steve’s got some thoughts on the whole drama.

Channing and Jenna -- who share 11-year-old daughter Everly -- finally settled their divorce last month after a long, drawn-out 6 years.

Unfortunately for Channing, his romance with Zoë didn’t stand the test of time either, and they ended their engagement after 3 years. The reason for their split is still unknown.