Kristin Cavallari celebrated the Fourth of July in style on Sunday with seaside party with her friends. The 34-year-old reality star grinned ear-to-ear in a fun snap posted to her Instagram account on Sunday as she and her pals posed on the bed of a pickup truck. As usual, she showed herself to be a master of elegant swimwear with an eye-catching rust-colored one-piece suit. Beach party: Kristin Cavallari, 34, showcased her svelte figure in a rust-colored one-piece swimsuit and cut-off jeans while celebrating the Fourth of July at the beach with her friends Kristin put on a busy display in the item, which featured a halter top and cut-outs showcasing her toned midriff.