By Debbie Emery - Breaking Celebrity News Reporter

Jennifer Lopez has a new younger man on her arm, and a new younger look to match!

The recently separated singer, 42, showed off fuller, plumper lips in New York City on Tuesday – all the better for kissing new love, 24-year-old Casper Smart! - and prompting speculation that she has gotten cosmetic surgery.

“Has J. Lo become an Idol for plastic surgery?” asked celebrity surgeon Dr. Anthony Youn, who has not treated the star.

“Her upper lip looks like it's been stung by a bee,” he went on to say. “I suspect that she's had a recent lip plumping procedure, likely with an injectable filler like Juvederm.

“Swelling from a treatment like this can last for a day or two. I bet by the time we see her on the next American Idol broadcast her upper lip will have settled down to reveal sensuous, pouty look.”

As Breaking Celebrity News previously reported, Lopez revealed this week that despite her pending divorce from fellow singer Marc Anthony, she hasn’t lost her sense of humor as she joked with late night host David Letterman about their acrimonious split.

The Jenny From The Block singer is the latest in a string of Hollywood beauties who have recently opted for a little helping hand to fight back the test of time.

Facing her 40th birthday this summer, Cameron Dia