Jennifer Lopez's smile is a real work of Smart

The shades-obsessed couple held hands after their New York dinner date, proudly flaunting their burgeoning romance.

Actress J-Lo, 42, was initially cagey about her relationship with dancer Casper who is 18 years her junior but they've been regularly stepping out as an item in recent weeks.

Casper's been more open about their romance, claiming Jennifer has an insatiable appetite for sex.

A pal revealed: "Casper said J-Lo has an amazing body and she's in better shape than any other girl he's ever been with.

"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."

Casper, of Anaheim, California, has been portrayed as a ladies' man who has dated a string of beautiful women and dances topless in front of screaming female fans at a Hollywood club.

One source said: "J-Lo obviously found his charms hard to resist. With an 18-year age difference, I doubt they have much in common.

"But who needs conversation when you have that physical chemistry."

Mum-of-two J-Lo split from singer Marc Anthony, 43, over six months ago after seven years of marriage.