Mom-to-be Lindsay Hubbard got a big surprise during a vacation in Italy with her boyfriend.

The pregnant Summer House star shared that she walked into their hotel room to discover that her partner had decorated it with pink balloons and flowers to reveal to her that they are expecting a baby girl.

"Stop!" she gasped to him, as seen in a video posted on her Instagram July 20. "What? No! We're having a girl?! Oh my God!"

The 37-year-old said in her post that her boyfriend, who she has not identified publicly, found out the sex of their baby before her and that his surprise marked the most special moment of her pregnancy.

"We left Milan on June 9th and took a car to Lake Maggiore," Lindsay explained. "He organized ahead of time for the hotel to set up our room with flowers and balloons to surprise me with when we walked in."

The Bravo star continued, "It is hard to surprise me, but not only did he pull it off, he crushed it! We couldn’t be more excited that our little cub is a baby girl!"

Lindsay had announced her pregnancy on the Fourth of July. "WE’RE PREGNANT!!!!!" she wrote on Instagram alongside photos of her baby bump and sonogram. "I truly believe the universe has a bigger plan and this is it!"

While Lindsay continued to keep her partner's identity under wraps, she has spoken about his devotion to her. "He is so beyond proud to be my boyfriend and the father of my child, and vice versa," she said on her Instagram Stories July 10. "We are very much in love and have a beautiful relationship."

She added, "This is about his work, his privacy and the fact that it is not his job to be public like me."

Her pregnancy—which her costar Paige DeSorbo had joked she manifested on Summer House—comes nearly a year after Lindsay called off her engagement to fiancé Carl Radke.

Keep reading to revisit their past relationship and breakup...

Before going public, Carl and Lindsay attended costars Kyle Cooke and Amanda Batula's September 2021 wedding as each others' dates.

After being friends and costars for years, Carl Radke and Lindsay Hubbard confirmed they were officially a couple at the start of 2022.

Carl got down on one knee and proposed to Lindsay in August 2022 in Southampton while filming season seven of Summer House.

The Bravolebrities enjoyed a romantic vacation in Italy. "One of the most beautiful places I've ever visited! And breathtaking (literally)," he shared on Instagram. "Finally getting through our travel photos with so many highlights but hiking through Cinque Terre was incredible. Bellisimo! "

Carl and Lindsay rang in Christmas 2022 surrounded by familymembers.

Carl and Lindsay opened up about planning their Mexico wedding in February 2023.

"It's taken this long for us to come together," she exclusively shared with E! News. "I don't think there is anybody in our lives that would let us get away with a small wedding, including Bravo."

Lindsay also confirmed plans to film the nuptials for season eight of the show. "If we were just getting married with all of our guests and friends that would be one thing," she continued, "but when you're considering the idea of filming it, there's another level of criteria that you have to get checked off."

The duo lets loose with their Summer House costars in Montauk in April 2023.

Carl and Lindsay attend a friends wedding in Florida.

The duo attend the Palm Tree Music Festival in New York with fellow Summer House couple Kory Keefer and Sam Feher.

Carl and Lindsay are all smiles while celebrating summer.

In honor of Andy Cohen's birthday, Carl shared a tribute to the Bravo bigwig.

The lovebirds celebrated Lindsay's bridal shower in NYC surrounded by their costars, including Danielle Olivera, Amanda Batula, Ciara Miller, Gabby Prescod and Samantha Feher. 

Less than three months before they were supposed to say "I do," news of Carl and Lindsay's breakup came to light in August 2023.

Exactly two weeks after the split news came to light, Lindsay broke her silence and revealed she's "heartbroken" and humiliated" with how Carl ended things.

"My trust has been betrayed, and coming to terms with that has been difficult for me," she wrote on Instagram Sept. 14. "This was not my decision, and I do not agree with quitting a relationship (at this level) without trying everything possible first. I have spent the last couple of weeks finding my own closure and peace. I am forever grateful to my best friends who have not left my side, and have been picking up the pieces of my heart and life every day from the fallout."