Diet & Fitness

Jessica Simpson flaunts slimmed down body in new swimsuit campaign

Jessica Simpson in swimsuit from her fashion line.

Jessica Simpson in swimsuit from her fashion line.

We don't know what's hotter -- the Arizona heat or Jessica Simpson!

The singer-turned-fashion designer flaunted her curves in a black fringed one-piece from her eponymous line's new bathing suit collection.

The Jessica Simpson Collection’s spring-summer 2015 line was appropriately named "Sedona." "I’ve always been inspired by the Southwest," Jess wrote on her website. "For our Spring 2015 campaign, my team and I packed our bags and hit the dusty trail, travelling [sp] eight hours -- by tour bus -- from Los Angeles to Sedona, Arizona."

PHOTOS: Jessica Simpson’s Best Instagram Pics

Jessica continued that "the adventure is in the journey," but can you picture this fashionista on a tour bus? Nope, neither can we!

Click here to subscribe to FOX411’s YouTube channel

NEWS: Jessica Simpson Gets Groped by Her Hubby While Rocking Her Daisy Dukes 

The 34-year-old looks like she was born with the modeling gene, as does her equally genetically-blessed daughter Maxwell. Jess recently Instagrammed a pic to celebrate her little girl's birthday. "May 1 my Maxi Drew turned 3…." the proud mom wrote. "I am in complete denial."

@jessicasimpson #SS15 #SWIM @nordstrom #fringe #jessicasimpson

A photo posted by Jessica Simpson Collection (@jessicasimpsonstyle) on

With her well-documented weight struggles -- both before and after having her daughter and 22-month-old son Ace -- it's nice to see Jessica as comfortable in her own skin as ever.