Kaley Cuoco and Johnny Galecki may have bursted the dating bubble last month but it seems that rumors about "The Big Bang Theory" stars won't end.

After being reported in October that the on-screen couple were dating, rumors have it again that Galecki and Cuoco are still smitten with each other, four years after their relationship in 2010.

According to US Weekly, Cuoco and Galecki have been one of Hollywood's friendliest exes ever after Galecki posted a photo with Cuoco playing around with each other-or rather biting another's neck.

With Galecki making Cuoco's neck a sweet treat in the photo, its caption reads: "Hilarious night out in the LA Arts District w/ @normancook #BFFsbite @ludwig1965 @bricuoco."

Although the "BFF" pair was spotted together during the release of the highly anticipated video game, "Fallout 4," eyewitnesses told E! News that the two showed no signs of public display of affection.

"They were just drinking and dancing with friends, and having a good time. They seemed to especially get excited when Bloc Party went on stage to play. They mingled with fellow stars like Chrissy Teigen, Kellan Lutz and Brittany Snow before calling it a night around midnight," the source added.

This was not the first time the pair blasted to the world how friendly they are to each other. Previous reports indicated that the pair also posted a photo of each other, making a buzz that they may have continued their halted relationship five years ago.

However, the photo says that they are nothing but "best buds."

"So sorry to disappoint, but no home wreckers or secret flings going on here," Cuoco said in her photo caption as she uploaded a photo with Galecki. "Me and @sanctionedjohnnygalecki are just the best of buds- Leonard and Penny will just have to suffice!!!"

Meanwhile, Galecki also played down the rumors, as he uploaded a snap almost similar to Cuoco and said: "No scandals / home wreckers / pregnancies here, y'all. Just profound friendship."

In September, Cuoco ended her marriage with Ryan Sweeting, citing "irreconcilable differences" as the culprit for the split. After the break up, the dating rumors with Galecki circulated.