Justin Timberlake and Jessica Biel hold hands as they explore the catacombs and go shopping in Rome

Justin Timberlake and Jessica Biel looked smitten while vacationing in Rome, Italy, on Monday.

The SexyBack hitmaker, 42, lovingly held hands with his actress wife, 41, as they explored the catacombs and enjoyed a day of shopping in the historic city.

Timberlake wore a blue polo shirt with jagged white stripes and comfortable blue jeans.

His casual look was completed with a white New York Yankees baseball cap, black sunglasses and a necklace.

Biel paired his ensemble with a white button-up shirt, layered over a matching fitted top, with black pants.

Perfectly in sync: Justin Timberlake and Jessica Biel looked smitten while vacationing in Rome, Italy, on Monday

Serving looks: The sexyback hitmaker was seen carrying a gold bag from Borsalino, a world-famous hat shop in Rome

Serving looks: The sexyback hitmaker was seen carrying a gold bag from Borsalino, a world-famous hat shop in Rome

The Candy starlet teamed her look with several layers of chunky gold jewelry, and also hid her face from the sun with chic black sunglasses.

She kept her auburn locks tied loosely in a sleek ponytail to keep her hair out of her face during the day’s program.

The couple enjoyed an action-packed day exploring the famous catacombs of San Callisto and splashing the cash at the world-famous Borsalino hat shop.

Earlier this weekend, the couple put on a sweet performance while visiting the famous Trevi Fountain.

The founding member of NSYNC was even seen throwing a coin into the fountain to make a wish, a tradition at the Trevi.

Although the couple has been married for 11 years now, the Grammy Award winner jokingly re-proposed to his wife in the comments of an Instagram post of hers, in which she called him “my boyfriend.”

The Tennessee-born singer proved he had a sense of humor about his wife’s playful roast, writing in the comments section, “I know this sounds crazy but will you marry me?” with a heart eyes emoji.

Italy was actually the location of the couple’s 2012 wedding, where they pledged their love for each other in a private ceremony at the Borgo Egnazia resort.

Narrate People that she had “a little bit of butterflies” about her wedding, the brunette beauty added: “I was about to stand up in front of my friends and family and bare my soul for the person I love.” It was terribly emotional.’

Leggy lady: The Social Network star and his equally famous wife got on an even keel as they leisurely explored more of Rome on Monday

Leggy lady: The Social Network star and his equally famous wife got on an even keel as they leisurely explored more of Rome on Monday

Loving wife: The 7th Heaven star kept a loving arm wrapped around her husband as they strolled through the cobblestone streets of Italy

Loving wife: The 7th Heaven star kept a loving arm wrapped around her husband as they strolled through the cobblestone streets of Italy

La dolce vita: The Blade: Trinity starlet epitomized Italian elegance in her afternoon outing

La dolce vita: The Blade: Trinity starlet epitomized Italian elegance in her afternoon outing

Singer with a smile: The Friends With Benefits star flashed a big smile as he dutifully walked next to his wife

Singer with a smile: The Friends With Benefits star flashed a big smile as he dutifully walked next to his wife

Top hat: The two triple threats took time to shop at Borsalino, a world famous hat shop in Rome

Top hat: The two triple threats took time to shop at Borsalino, a world famous hat shop in Rome

To keep things casual, Justin and Jessica played the role of tourists this past week, eagerly exploring historic catacombs and other parts of the city together

To keep things casual, Justin and Jessica played the role of tourists this past week, eagerly exploring historic catacombs and other parts of the city together

I want it this way: The NSYNC member stood out on a flight of stairs in Rome with Jessica following close behind

I want it this way: The NSYNC member stood out on a flight of stairs in Rome with Jessica following close behind

Major star energy: The Mirrors singer waited patiently for his wife as they headed to their next stop in Rome

Major star energy: The Mirrors singer waited patiently for his wife as they headed to their next stop in Rome

Couple Goals: The Minnesota-born stunner got her man laughing as she left Borsalino's hat shop

Couple Goals: The Minnesota-born stunner got her man laughing as she left Borsalino’s hat shop

Take me to the church: In addition to the catacombs, the couple also visited the church of San Callisto

Take me to the church: In addition to the catacombs, the couple also visited the church of San Callisto

Lucky in love: the pair never let go of each other's hands as they also enjoyed lunch in the city center

Lucky in love: the pair never let go of each other’s hands as they also enjoyed lunch in the city center

Strike a pose: The Texas Chainsaw Massacre star seemed more in love than ever with her singing superstar husband

Strike a pose: The Texas Chainsaw Massacre star seemed more in love than ever with her singing superstar husband

Follow my lead: The Blade: Trinity star also wore a chic red manicure

Follow my lead: The Blade: Trinity star also wore a chic red manicure

In sync: the actor and singer turned the streets of Rome into his catwalk as he strolled past the Bar del Fico

In sync: the actor and singer turned the streets of Rome into his catwalk as he strolled past the Bar del Fico

The singing half of the superstar couple will soon have his hands full performing on the highly anticipated NSYNC reunion tour.

He also recently had a leading role in the Netflix film Reptile.

Meanwhile, Jessica went brazenly viral in August when she posted a throwback photo of her husband in an NSYNC video wearing a white tank top.

She mentioned that she was wearing a white tank top in the humorous post and captioned it with “Hey Siri, play Mirrors by Justin Timberlake,” referencing the hit single he wrote that was inspired by her.