Kelly Osbourne shared a cryptic tweet about "liars" on the same day that Giuliana Rancic decided to "tell the truth" about her Fashion Police controversy -- Us Weekly can exclusively reveal whether the tweet was really aimed at Rancic. Credit: Jason Merritt/Getty Images

Liar, liar, tweets on fire! Kelly Osbourne shared a cryptic tweet about "liars" on Monday, April 6, the same day that Giuliana Rancic decided to "tell the truth" about the Zendaya, Fashion Police controversy on the Today show.

Sources confirm exclusively to Us Weekly that Osbourne's tweet was indeed aimed at Rancic. "The tweet is definitely about Giuliana," one source tells Us. "They're totally feuding."

On Monday, Rancic finally opened up about her controversial remarks regarding Zendaya Coleman's dreadlocks during Fashion Police's Oscars episode back in February. ("I feel like she smells like patchouli oil," Rancic said. "Or weed!") As previously reported by Us, Osbourne warned Rancic about the joke during the show's taping. Without heeding her colleague's concerns, Rancic ultimately went ahead and delivered the line, which resulted in surmounting backlash.

"I think it's time to just tell the truth," Rancic, 40, told Savannah Guthrie on Monday. "I find racism reprehensible. I don't tolerate it at all. Nor have I ever."

While Rancic understood "why people took offense," the E! News host never intended for her comments to come off the way they did. "I thought the joke was not edited in the proper way. That's just something I have to live with," she said. "It's very important for me to get out there and tell the real story."

Another source tells Us that Osbourne took issue with Rancic deflecting blame on the Today show. "Kelly cannot understand why Giuliana keeps talking about editing when there was a whole audience and crew who heard and saw otherwise!" the second insider tells Us. "Kelly thinks Giuliana should have just been truthful, apologized, and moved on."

Both Osbourne and Kathy Griffin have left Fashion Police since the scandal erupted. E! subsequently announced that the show would go on a hiatus until September.

Osbourne spoke out about her headline-making departure from Fashion Police last month on The Talk. "Working with Joan Rivers for five years was incredible," she gushed. "I learned so much. I’m excited for my future now. I want to try new things." Osbourne further teased her next big move in a Facebook Q&A on Tuesday. "It's really exciting, probably one of the biggest things I've done in my career," she told fans. "I can't wait to tell you guys about it!"

Rancic, meanwhile, confirmed that she hadn't spoken to either Osbourne or Griffin since the controversy began. "I haven’t [been in touch] with them at all," Rancic said on HuffPost Live on Tuesday. "I can’t speak for them, what they meant by those comments. Nothing good can come from trying to speak for them."