'You will regret this for the rest of your life' Chris Brown tells Soulja Boy after Soulja involves Royalty in their feud

               

                
But it was actually Chris' baby mama, Nia Guzman who posted the photo and Soulja just reposted it.

When TMZ spoke with her, Nia said her Royalty pic had nothing to do with Chris and Soulja's celeb boxing match. She also said she and Royalty have been hanging out with Floyd recently ... and "Floyd is investing in Royalty's future."

Watch Chris Brown's reaction below...

IM NOT PLAYING! Krossed da line...... We gone push this fight UP!!! I promise you are regret this for the rest of ya life

A video posted by 1 YOU ❤️ 2 HATE (@chrisbrownofficial) on Jan 5, 2017 at 7:31am PST