"One and DONE! I love you forever @njw_0401," Sydney, 29, captioned a slideshow of photos from her engagement, along with a diamond ring and heart emoji.
Sydney toldPeople that accepting Nick's marriage proposal was a no-brainer.
"I said 'Yes' without any questions and am so excited to get to spend forever with him," Sydney gushed to the magazine.
"I always knew I would be one and done and was waiting for the right person. Nick was my first and only boyfriend and is now my fiance and will eventually be my husband. He was very much worth the wait!"
Since Sydney admitted she's "hard to surprise," Nick apparently got "creative" with his marriage proposal.
Nick decided to ask the couple's favorite photographer to do a holiday photo shoot for them, and Sydney was able to choose the location, date, and attire so she wouldn't suspect anything.
And little did Sydney know that her holiday photo shoot was going to turn into her engagement photo shoot.
The Bachelor alum and Nick became romantically involved while they were quarantining in 2020 at the start of the coronavirus pandemic.
"Nick had watched me on The Bachelor and for whatever reason took a liking to me," Sydney told People.
"We [started] talking back and forth via Instagram, then texting, and eventually FaceTimed for 3 months before ever meeting in person."
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Sydney had a feeling that when she eventually found her first boyfriend, it "would be the real thing."
"So I continued that search after leaving the show, which eventually led me to Nick!" Sydney shared.
Once they met in August 2020, Sydney said she and Nick had something "really special" and so they decided to take their relationship "to the next level" and moved in together "on a whim."
Sydney, who moved into Nick's place, recalled, "We built an amazing connection just over the phone. I got to really know him as a person on so many levels. It was almost like The Bachelor bubble except without cameras and the other suitors."
"I saw what an amazing man he is from the way he cares for his family and all that he has overcome," she added.
Now that Sydney and Nick are engaged, she noted how they're just enjoying the celebration and are "soaking in this moment."
On wedding plans, Sydney confirmed, "We're not there yet, but will probably start brainstorming venues at least soon."
Sydney quit Colton's season of The Bachelor during a group date in Vietnam because she didn't think their relationship was progressing at a fast enough pace.
"After making it as far as I did and pushing myself out of my comfort zone I knew that this wasn't my love story," Sydney wrote on Instagram in February 2019, once her departure aired on the ABC reality dating series.
Sydney's exit rocked Colton's world and left him questioning which of the remaining women were really there for him and ready to get married.
Before she exited the show, Sydney advised Colton to pay attention to the wonderful women in the group and not be distracted by "shiny things."
"I auditioned for this show as a funny afternoon with a friend and never thought that it would go anywhere past there. In a way it landed in my lap, which in my line of work rarely if ever happens," Sydney continued in her Instagram post.
"This led to me deciding between continuing with a job that I loved and worked incredibly hard for and this exciting, scary opportunity focusing on something I had been putting on the back burner always."
Sydney held down a job as a professional NBA dancer prior to appearing on The Bachelor, and she told Colton on Night 1 she had to quit an awesome gig in order to pursue dating him.
"I'm 27 and have never had a boyfriend and have always chosen to focus on my job, my responsibilities, and my passions over relationships and life events and this made me challenge that head on," Sydney wrote.
"I didn't fail, I tried my hardest, I was authentic and ultimately did the thing that I would have always wondered about had I not gone."
Sydney said she wondered whether she had made the "right" choice in dumping Colton but she really missed her team and dancing center court at the time.
"For now, I will continue to push myself out of the routine and open myself and my heart up to love and my happy ending, not settling for anything less," explained the brunette beauty from New York, NY.
"Hoping to find my lifelong dance partner soon! Thank you to everyone who supported me, watched with me, and believed in me. You all have my rose."