"I feel it's important for me to say this, and I'm only going to address this once..." Lala wrote on her Story.
"My sobriety is something I'm proud of and work on [every day]," she continued in another post. "I've never done cocaine nor were any other substances, other than alcohol, involved in my decision to get sober. I pride myself on being open and honest about everything in my life, hopefully inspiring others and letting them know they are not alone."
"The past couple of days I've been slammed to say the very least," Lala added. "People have asked me how I'm maintaining keeping my head up... To me it's simple -- I know Real Life from the illusion of social media. I know what it feels like to have your world crumble. Getting a phone call from your brother saying your dad has passed away...that is earth-shattering."
"Getting called names and being falsely accused of things...that is far from earth-shattering," she wrote.
"My mindset is something I'm grateful for," Lala concluded. "However, I can't help but think about how many people are taking their own lives, daily, due to cyberbullying. It is imperative that I tell you, you are not by yourself. I see you. I stand by you. I'm on your team. You are loved and make a difference in this world."
Fifty shared one of Lala's posts and wrote, "shut up bitch, you started with the wrong person good night."
On Monday morning, Fifty started off the week by taking a jab at Lala and her fiancé, Randall Emmett.
"Rise in shine puffy face," he captioned a photo of Lala and Emmett. "it's gym time but I'm sure your [sic] having a hangover. welp here's to life buck O. LOL"
The image also included the words, "Good morning drunk face" with a cocktail emoji.
Lala's posts Sunday night came just two days after Fifty went off on the Bravo star on Instagram Friday. The rapper was reacting to the reality star claiming on "WWHL" she had proof she "dinged" Fifty's ego following their public social media beef.
Sharing multiple posts to his profile, the "Power" producer slammed Lala and her relationship with Emmett -- hitting everything from the reality star's sobriety to how the couple got together. Fifty even insulted both Lala and her man's appearance.
The "In Da Club" rapper took a shot at Lala's battle with alcoholism. (Back in May, Lala confessed to Andy Cohen during last season's "Vanderpump Rules" reunion that she was drunk for "four days straight" while on a trip to Disney World with Emmett and his two daughters.)