After her murder case acquittal, Amanda Knox's life is already starting to return to normalcy. Raffaele Sollecito's ex-girlfriend recently went out with friends on a karaoke bar as the student was also reportedly taking Krav Maga lessons for self-protection.

"Knox took a stab at the Cranberries hit 'Zombie' Tuesday night at Keats, a karaoke bar. We're told the patrons at the bar cheered when Knox arrived," said TMZ. "Earlier in the evening, Knox attended the Innocence Project Gala at the Grand Hyatt Hotel nearby."

During the event, comedian John Mulaney posed for a photo with Amanda Knox whom she described as "brave and wonderful" after her murder case acquittal.

Meanwhile, Amanda Knox has been taking Krav Maga lessons, developed by the Israeli Defense Force, after reportedly receiving death threats following her murder case acquittal.

"It is known for its efficient use in 'real-life' situations, and extreme counter-attacks using a combination of boxing, wrestling and chokeholds," said Daily Mail. "It is not known whether Knox is learning Krav Maga ('contact combat') as a direct result of the alleged death threats."

Earlier, the FBI was called in after death threats to Amanda Knox in connection to her murder case.

 "We've been given reason to believe they have the ability to carry out their threats. We know who it is and their address. The FBI is investigating," a source told Radar Online. "The vast majority of internet trolls harassing Amanda are British."

Raffaele Sollecito, meanwhile, has distanced himself from his former girlfriend, Amanda Knox, after they were cleared of the murder case.

Earlier this year, the Italian Supreme Court acquitted Amanda Knox and Raffaele Sollecito of the murder case in connection to the death of her roommate Meredith Kercher who was killed insider their Perugia flat in 2007. As a result of the acquittal, Rudy Guede-who is currently in jail for the killing-said that he would also appeal his case.