The 42-year-old singer announced the end of her seven-year marriage to husband Marc Anthony four months ago. Now she is believed to have met dancer Casper Smart, 24, when he started working on her world tour six months ago.
A source claiming to be a friend of Casper's told The Sun that their romance is based on chemistry alone.
'Casper said J-Lo has an amazing body and she's in better shape than any other girl he's ever been with,' said the insider.
'He said she's got the body of a 20-year-old. They're inseparable right now.
'It's just about sex — and no one's sure if it has much of a future. But he's having a good time finding out.'
A second source added, 'With an 18-year age difference, I doubt they have much in common.
'But who needs conversation when you have that physical chemistry.'