Casper Smart Bonds with Jennifer Lopez's Kids in Hawaii

J.Lo's new beau got close with her twins Max and Emme while vacationing with the fam over Thanksgiving weekend

Jennifer Lopez has been touring with her back-up dancer beau for months -- and now, she's taking him on vacation! Casper Smart, who Lopez has been casually dating for a few weeks, accompanied her on a Thanksgiving trip to Kauai, Hawaii. They spent six days relaxing on the beach with other members of J.Lo's family, including her mother Lupe and her 3-year-old twins with ex Marc Anthony, Max and Emme.

"Casper was great with the kids," an eyewitness tells Us Weekly.

In pictures obtained by the publication, Lopez, 42, dips her toe in the water while Smart, 24, holds Emme upside-down over the surf. According to the witness, Casper also twirled the twins around in the water and was "it" in a game of tag.

Lopez and Smart were also caught kissing on-camera for the first time, in recently released paparazzi shots taken outside a rehearsal for the American Music Awards earlier this month. Just in case that Hawaiian vacation left any doubts about their status!

Not everyone approves of Lopez's younger man, though. Smart was mocked via Twitter this weekend by former That '70s Show actor Danny Masterson, who posted a pic of Smart with the caption "Whoa! When did JLO start dating Vanilla Ice?"

But if hip-hop dancer Smart was offended at being compared to the whitest of white rappers, he didn't let it show.

"I saw it," he tweeted following Masterson's post. "In the sun but still pale... LOL."

Hey, if Max and Emme like him, who cares which early-90s rapper he resembles?

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