Jennifer Lopez takes the plunge during a day at the pool with Casper Smart and the twins

Things between Jennifer Lopez and Casper Smart seemed to get a little iffy there for a minute — ya know, around the time he was photographed entering a 24-hour peep show in New York City — but the singer and her dancer beau appeared to be the picture of happiness on Thursday when they had a pool party with her twins.

Taking a break from her summer tour with Enrique Iglesias, Lopez made a splash at the SLS hotel pool in South Beach. Wearing a fringed yellow bikini, the 42-year-old was all smiles while having fun in the sun. With her hair casually knotted above her head, she laughed a lot throughout the day, including when she jumped into the pool.

Lopez and Smart, 25, spent much of the time playing with her 4-year-old twins, Emme and Max. They took turns squirting a water gun, and Smart acted like a human diving board, helping the kids stand on his raised hands and then letting them jump off. When the couple took a break from the water, they sat side-by-side on lounge chairs. Lopez gazed adoringly at her boyfriend of 10 months. He had on a tank top, showing off his extensive tattoo collection, and rather large diamond earrings.

This is the final weekend of Lopez's tour with Iglesias, which has kept her busy since her departure from "American Idol" in May. Although she earned a reported $20 million for appearing as a judge on the reality show, she opted not to re-sign. As a result, the Fox series is getting revamped. In addition to her departure, Steven Tyler and now reportedly Randy Jackson are out. Though Mariah Carey will be part of the new season when it returns in January, the other spots are still up for grabs. Rumor has it that Keith Urban and Nicki Minaj are close to inking deals.

"I honestly feel like the time has come for me to be doing the other things I do that I've kind of put on hold because I love 'Idol' so much," Lopez, who has been filming a 3D concert movie (like Katy Perry's "Part of Me" and Justin Bieber's "Never Say Never"), told the Associated Press earlier this summer. "I do miss doing films. I feel like the last two years with 'Idol,' I've really, really focused on, you know, my music. ... It was all kind of very synergistic, it worked really well together. But (film) is something that I really loved, it's how I kind of started in this business, and it doesn't leave you. I am an actress, I need to do that, too."

But before you'll get a chance to see her on the big screen, she'll be on the small one. She will be one of Katie Couric's first guests on her new talk show, "Katie," which debuts in September.

And, of course, we expect you'll be seeing more photographs of her cuddling up to Smart.

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