Jennifer Lopez's family "keeping close eye on Casper Smart"

Jennifer Lopez recently celebrated her 43rd birthday with one very handsome man attached to her hip, her boyfriend Casper Smart. However, despite the smiling faces, there is a reportedly a lot of concern around J Lo's toyboy's motives.

Casper, 25, was recently spotted walking up stairs which lead to an exotic massage parlour in New York. Quick to defend the allegations, Casper even threatened a lawsuit against the reports. The reports are still bound to make the singer concerned, as a source has revealed the the star's family are keeping a close eye on Casper.

"He's moved into her life - and a little too easily, too, I think her family is watching him closely."

After splitting from her former husband, actor Marc Antony, Jennifer embarked on a relationship with Chris, but the source claims she's beginning to get frustrated with the back-up dancer.

However, the source has revealed that she won't ditch Chris until she's found a new beau, saying,

"She's getting frustrated with him, short-tempered when she's around him...Jennifer is the kind of girl who doesn't like to be alone, until she finds a replacement, I think, he's around."