Is Jessica Simpson taking her new husband's last name?

Ten days after the singer and fashion entrepreneur married former NFL player Eric Johnson, Simpson posted a swimsuit photo of herself Tuesday on Instagram, captioning it "Jessica Johnson."

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It was unclear if the 34-year-old is contemplating a formal change of name. Her Instagram page itself remains titled "Jessica Simpson," as do her Twitter and Facebook pages, her official website and her fashion line, the Jessica Simpson Collection.

She and Johnson, 34, married July 5. The couple have 1-year-old son, Ace, and daughter, Maxwell, 2.

Meanwhile, Simpson's ex-husband, singer Nick Lachey, 40, announced Tuesday that he and his wife, Vanessa, 33, were expecting their second child. Posting a photo of their 22-month-old son, Camden, cavorting near a heart drawn on sand, with the words "It's a girl" inside it, Lachey tweeted, "Can't think of a better way to celebrate 3 years of marriage to my beautiful Vanessa Lachey than this!"