The lovebirds married 11 months ago in a lavish wedding that was covered by HELLO! Magazine, but it has only just emerged that the Total Recall actress has legally changed her name.
"It's all official," an insider told Life & Style. "The paperwork is done and she's now legally Jessica Timberlake."
The Hollywood star will keep her maiden name for professional purposes.
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"It's funny. It feels like nothing's changed and yet everything's changed," said Jessica, speaking as a newlywed. "It's kind of that intangible thing you can't quite put your finger on."
"But I like the idea of having a partner in crime. I guess the word 'husband' is pretty amazing. It's so fun to say, 'This is my husband!'"
Justin, 32, and Jessica, 31, tied the knot in a magnificent wedding in Puglia, Italy. On their special day, the Suit & Tie singer presented his bride with a unique gift — a song Justin had written especially for her, which he performed at the ceremony.
"I figured if there was something I was going to be able to offer, it would be to sing her down the aisle," said Justin, speaking to HELLO! Magazine.
"Grown men were weeping. Hopefully it's because I didn't sound bad."
Justin added that the moment after the couple exchanged vows was one of the most memorable highlights of the day.
"To hear all of our family and friends cheering at extremely loud, inappropriate decibel levels, that became the pinnacle of the ceremony," he said.
"It felt perfect. It felt like everything came together."
The Hollywood sweethearts had been dating since 2007, and after a brief split in 2011, the couple got back together and Justin proposed while on holiday in December of that year.