JoJo performed at the Hard Rock Cafe in Boston on Thursday, where she transformed Bruno Mars’ hit single 'Grenade' into an emotional acoustic cover.

The 20-year-old songbird was accompanied by a female guitarist, who plucked away at a six-string while JoJo steered the ship. The pop/R&B singer slowed Mars' tune down, showing off all of the nuances of the brokenhearted smash.

In addition to 'Grenade,' JoJo also graced the audience with her songs 'Too Little Too Late,' 'Leave (Get Out)' and her latest single, 'Disaster.' The Mars tune isn't the only cover she's done on her intimate tour -- the Boston native recently took on Rihanna’s 'What’s My Name?' on her Baltimore stop.

JoJo wrapped a U.S. run with Joe Jonas and Jay Sean in early October. Her recent string of dates have been been free to the public, serving to promote her forthcoming album, 'Jumping Trains,' and raise awareness for breast cancer. The trek will continue around the U.S. before wrapping in Chicago on Nov. 1.

'Jumping Trains' is the singer's third studio album, due out in early 2012. The long-awaited LP follows her 2004 self-titled debut and her 2006 album, 'The High Road.'

Watch JoJo Cover Bruno Mars' 'Grenade'