Chris Brown and Rihanna Heating Up?

(Image Credit: Rick Diamond/WireImage/Getty Images)

It was a busy weekend for hip-hop stars Rihanna and Chris Brown: First, Rihanna tweeted a shirtless photo of what appears to be ex-boyfriend Chris Brown, followed by her own topless photo. Then Brown launched into a vulgar attack on comedy writer Jenny Johnson before deactivating his Twitter account altogether.

It all started Saturday with Rihanna's posting a photo of what looks to be a half-naked Chris Brown lying face-down, his highly recognizable tattoos visible, on a bed covered with "The Simpsons" memorabilia and a handbag. The "Diamonds" singer posted the photo on Twitter, along with the hashtag "BartObsessed."

(Image Credit: Twitter/badgalriri)

Hours earlier, Brown had posted a photo of himself wearing a Bart Simpson jacket.

The following day, Rihanna posted her own topless photo, along with the hashtag, "LondonNightLife." Wearing tiny black spandex shorts, the singer posed with her bare back facing the camera while shooting a "come hither" look over her shoulder.

(Image Credit: Twitter/badgalriri)

Although Brown and Rihanna have yet to confirm that they are back on, their latest antics continue to fuel the rumors.

Rihanna was photographed Thanksgiving night getting into a car with Brown in Berlin, after attending his concert in the German capital, followed by a nightclub after-party.

Not everyone is pleased with the possibility of their getting back together. Brown got into a Twitter feud Sunday with popular comedy writer Jenny Johnson, who tweets under her handle @JennyJohnsonHi5.

Johnson has poked fun at Brown since his 2009 arrest for beating Rihanna, for which he pleaded guilty to assault, but the comedian caught his ire over the weekend after responding to his tweet about how old he looked.

"I know! Being a worthless piece of s*** can really age a person," she tweeted in response.

Brown then hurled sexually graphic insults at her, but Johnson did not back down, even correcting Brown's spelling, saying: "It's 'HO' not 'HOE.'"

"I have zero respect for a person who seems unapologetic for the terrible crime he committed and shows no signs of changing," she wrote at the end of the exchange.

"Just ask Rihanna if she mad??????" Brown wrote, before he deactivated his account, which was then restored minus the worst tweets.