Robertson moved in with The Bachelor star and his two roommates in San Francisco on March 17 after packing up her belongings and traveling almost 400 miles upstate from Santa Monica, CA, Us Weekly reported in its April 2 issue.
Although the 28-year-old model will be sharing space with three people, it's reportedly only temporary as she and Flajnik are on the lookout for a home to call their own.
"They want to get settled in as soon as possible," a source told Us of the couple, who appeared to be unpacking Robertson's things from a U-Haul vehicle in published photos.
Robertson -- who got engaged to Flajnik when he selected and proposed to her duringThe Bachelor's sixteenth-season final Rose Ceremony, which was filmed on November 16 -- had previously said she planned to initially maintain a long-distance relationship with Flajnik and move to Sonoma within a few months.
"We're thinking long term," Robertson told People in an interview published shortly after ABC's broadcast of the show's finale.
"I'm going to try and get up to San Francisco in the next few months. We'll move in together, and if things go smoothly, we'll definitely plan a wedding. Right now it's 'Let's have fun getting to know each other.'"
According to another Us source, Robertson is willing to do whatever it takes to make her relationship with the 29-year-old winemaker work.
"[Robertson] is willing to deal with the public disdain if it means she can keep him. She wants to save this relationship," the source said.