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Say goodbye to Jessica Simpson and hello to Jessica Johnson! 

The singer and businesswoman, 34, took to Instagram this week after her July 5 wedding to former NFL player Eric Johnson. While her handle and profile still read "Jessica Simpson," she posted a photo on Tuesday morning, July 15, which is captioned simply, "Jessica Johnson."

PHOTOS: Jessica's toned legs

The mother to daughter Maxwell, 2, and son Ace, 12 months, tried out her new last name on a sexy shot. In the black-and-white image, Simpson reclines on a towel-covered lounge chair with her legs crossed. 

Holding an iced drink, Simpson wears a figure-hugging plunging printed one-piece swimsuit, which shows off her toned body and famously shapely legs. Her long blonde locks relaxed and down, she reaches for her oversized sunglasses with her free hand. 

PHOTOS: Jessica's Us Weekly covers

The fashion designer looks amazing as she prepped to become wedding-ready. She said "I do" to Johnson, also 34, in Montecito, Calif. in a swanky ceremony, which was attended by 275 guests. 

Following the A-list affair, Mr. and Mrs. Johnson jetted off to Mexico for a little honeymoon at the Four Seasons Punta Mita Resort, Us Weekly learned. Staying at one of the hotel's presidential suites, the newly married couple spent time "lounging around at the resort and enjoying their first week together as husband and wife," a source tells Us. 


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