Jessica Simpson has apparently taken her husband's name.

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The 34-year-old singer posted a swimsuit photo of herself Tuesday on Instagram, and captioned the shot with "Jessica Johnson."

Simpson and retired NFL star Eric Johnson married earlier this month in Santa Barbara, Calif., and the new picture may have been taken at an undisclosed honeymoon location.

Simpson and Johnson have been together since May 2010, and have two children together: 2-year-old daughter Maxwell Drew and 1-year-old son Ace Knute. Maxwell served as flower girl and Ace as ring bearer at their wedding July 5.

"We are overwhelmed with complete happiness and love having made our eternal commitment," the couple said in a statement after their wedding. "To say 'I do' in front of family, friends and, most importantly, our children has been the happiest moment of our lives."

Simpson celebrated her 34th birthday last week, and posted a similar swimsuit photo with the caption, "And the sun sets on 33."