You didn't think Gilbert Arenas was going to let his ex, Laura Govan, tease a tell-all book including an explosive rumor about him without saying something, did you?

Nah, this is the self-proclaimed "#KingPetty" we're talking about here.

After learning that Laura's planned book would include the allegation that Arenas slept with her sister, Gloria Govan, back in the day, the former NBA All-Star destroyed his baby mama with a scathing, dragging Instagram post Tuesday.

In the process, No Chill Gil tried to make it clear that Laura is making up the story just to sell her tell-all and that he never had sex with Gloria.

[Warning: The following Instagram post contains profanity].

Welp. Well, damn. Not only did Gil provide a lengthy back story in an attempt to shoot down the allegation, but he also said Gloria's ex, Matt Barnes, would have given him the beats had he slept with her. Derek Fisher would probably corroborate on that.

Arenas also said that he and Barnes haven't had beef to this day, but that Laura and her sister Gloria do. Oof.

For what it's worth, Barnes himself seemed to shoot down the nasty rumor as well upon learning of Laura's planned tell-all, saying, "Everyone wants to be famous."

Judging from Arenas's past — and his alleged $3 million court victory against Laura for lawyer fees and damages — we can easily see No Chill Gil drag his baby mama back to court over this allegation. If that happens, we just wonder if Gloria will be required to speak on it. Hmm...

Whatever winds up happening, this situation between Gilbert and Laura is well beyond messy.

We just hope they can come to some level of coping for the sake of co-parenting their four kids.

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