Credit: Splash News

Fashionista Jennifer Lopez didn't go shopping on Black Friday. Instead, she feasted her eyes on Casper Smart, her 24-year-old dancer beau of just a few weeks, who doffed his top during a sexy Thanksgiving vacation in Kauai, Hawaii.

New photos from Friday reveal Lopez, 42, sipping a tropical cocktail and lounging in her bikini in a cabana alongside her topless, muscular new man. As previously reported by Us Weekly, Lopez, Smart and her 3-year-old twins Max and Emme spent the Thanksgiving holiday in Hawaii. See more pics of the hot new couple in Hawaii.

"Casper was great with the kids," a source told Us. During a Thursday outing on the beach, Smart (who's performed with Lopez onstage numerous times) "was twirling them around and doing flips with Emme and she seemed very comfortable with him."

Two Sundays ago -- following a hot performance at the American Music Awards -- the new couple packed on the PDA at a post-AMAs bash in L.A.

No word yet on whether Lopez and Smart are exclusive. In early November, Lopez hooked up with ex Marc Anthony (they split in July after seven years of marriage) in Puerto Rico.

Cautions a friend of the former super-couple: "They may sleep together, but they're over!"