Joe showed off his chest and defined arms as he hung out in the beach shirtless, clad only in a pair of black and white board shorts.
Meanwhile, while Joe sows his wild oats, his brother Nick has made massive headway with older girlfriend Delta Goodrem.
The 19-year-old singer invited his 27-year-old girlfriend to spend the holidays with his family in Hawaii.
Joe tweeted at his brother's girlfriend of seven months: '@delta_goodrem so happy to have you here with the fam. Had an awesome time.'
His spirits seem to be up as well. He tweeted: 'I've had an amazing time with family. How was it for you?'
His current level of happiness might be due to the fabulous Hawaiian weather, or down to the fact that he reportedly has a new love interest.
The New York Post claims that the pop star is wooing model Jessica Pott and that the two have been seen club-hopping around New York City.
The Brazilian stunner would be the latest in a long string of gorgeous girls for playboy Joe, who has also dated Ashley Greene, Demi Lovato and Taylor Swift.
A source told the newspaper that he and Pott are, unsurprisingly, 'not exclusive'; her rep admits that 'they do know each other' though says they aren't dating.
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