Danni Arslow is a character in 2010 horror film Piranha 3D. She is portrayed by an English actress Kelly Brook.
Danni first appeared when she arrived at the store where Laura was practicing. After having a brief conversation with her, Laura Forester (Brooklynn Proulx) remarked that she liked Danni's boobs and that her brother Jake Forester (Steven R. McQueen) would like them. When Derrick arrived and asked where Crystal and Drew were, it appeared that Crystal was clearly Derrick's favorite girl, something Danni didn't seem to bothered about. When Jake arrived, Danni seemed to take a shine to him, and Derrick employed Jake to find them a good spot on the lake the following day so Danni and Crystal Shepard (Riley Steele) could perform. That night, Jake looked on the Wild Wild Girls website and viewed videos of Danni, Crystal and various other girls who worked for Derrick Jones (Jerry O'Connell). He was then interrupted by his mother, who clearly knew what Jake was up to.
The following day, Jake arrived at the lake to see a huge party going on where all the boats were docked. He was surprised to see Danni and Crystal dancing crudely in front of many party goers. The party goers were delighted by Danni and Crystal. Then they started to ask for a motorboat, Danni and Crystal were laughing then they were face to face, Danni put her hands in her head and her chest was right in front of Crystal, Crystal put a finger in Danni's boobs, and she started to getting her face close to them. Crystal motor-boated Danni, Danni was laughing while the crowd cheered.
Afterwards, Danni, Crystal, Jake, Derrick, Drew, and Kelly Driscoll (Jessica Szohr) all left on the boat, where Derrick intended to film the girls doing various activities, including drinking beer off of each other's stomachs and swimming nude under a glass bottomed tank.
Following the nude activies, Danni put a top over her red bikini and went to sunbathe on the front of the boat. Meanwhile, Derrick crashed the boat into the rocks, causing Derrick and Crystal to fall from the boat. Crystal was killed by the piranhas, before Danni frantically hoisted a half eaten Derrick onto the boat. When Jake shielded Laura and Zane from the sight of Derrick's mutilated legs, Danni manically hit the piranhas off of him with a paddle. But, tragically, Derrick later died.
As the boat began to sink, Jake contacted his mother to come and help them as the piranhas poured into the bottom and tried to attack Kelly. Danni seemed to take on an adult role from this point on, protecting the children until the sheriff arrived. When she did, the sheriff decided to save Danni and the children by tying the rope from one boat to another. They decided to put Danni and the sheriff on either end, with the children in the middle while Jake tried to rescue Kelly from the bottom deck.
Danni, Sheriff Forester, Lauren and Zane all tried to cross the rope over the water. Suddenly, piranhas appeared in the water below and began to latch onto Danni's hair. This caused her to stop and hang from her legs on the rope, where she tried to remove them from her hair, but this caused her to sink lower towards the water, where the killer fish latched onto her arms and face. She desperately held on as the piranhas ate away at her eyes, but ultimately could not hold on any longer and fell into the depths of the lake.