Chris Brown Drug Scandal, 'Sippin Lean' With Tyga Hurts Baby Royalty Custody Battle? [PHOTOS]

Chris Brown's a great father to adorable one-year-old daughter Royalty, despite an ongoing custody battle with infamous baby mama, Nia Guzman. But old habits die hard - rumors now suggest that Breezy was recently spotted "sippin lean" while partying with fellow rapper Tyga [again]. Will Breezy's ongoing drug use eventually ruin his relationship with Royalty?

The "Rack City" emcee's son King Cairo Stevenson just celebrated his third birthday on October 16. Close friends and family were invited to a private bash at T-Raww's home in Calabasas, and of course Brown attended (with his little girl). But while festivities continued inside, the 26-year-old hip-hop star snuck to the driveway with a group of pals. Apparently, the seedy gossip webloid MediaTakeOut.com later obtained "exclusive footage" showing the guys enjoying some "purple drank." According to Urban Dictionary, "sippin lean" actually means:

To create the popular drink originated from Houston Texas, you require the following for the original formula:

-Promethazine w/Codeine VC <- Sizzurp (active ingredient)
-Original Sprite Soda <- Mixing ingredient (although different flavors of sprite are now used, such as sprite remix)
-Jolly rancher candy <- Flavor additive

Put it all in a styrofoam cup and enjoy. The codeine is mainly responsible for the euphoric feeling after drinking lean. Promethazine causes motor skill impairment, lethargy, extreme drowsiness, as well as a disassociative feeling from all other parts of the body, specifically the stomach and digestive system. If it doesn't have promethazine with Codeine, it isn't real sizzurp.

The mixed drink combination - known as "lean" - is normally the color purple, due the added ingredient sizzurp, which is originally a dark purple syrup. There are other colors of sizzurp which can be added to create lean, but the purple is the true sizurp

Lean does not contain ANY form of alcohol, crushed pills, or other liquids in general.

View the viral screenshot images here. As MTO points-out (to clearly avoid any legal responsibility):

"It's not clear whether Chris is [sippin lean] too... but he has a DOUBLE CUP with a mystery liquid inside it."

So - what do MstarsNews readers think? Will Guzman use this evidence of "shady behavior" against Breezy in their next joint custody hearing?

The "Loyal" crooner remains mum on Instagram, so stay tuned as more confirmed details develop.