He tweeted 1st pic out in public and posted an Instagram photo of him and Robertson.
The 28-year-old model from Arizona stole Flajnik's heart while on The Bachelor.
Her moves to nab the California winemaker -- and the friction she had with other contestants -- prompted a great deal of backlash, both from the contestants and the viewing public.
But love -- or infatuation -- prevailed, and Flajnik got down on one knee in the season finale.
Later, before that episode aired, photos posted by Us Weekly showed him looking cozy with other women.
Flajnik revealed in the After the Final Rose episode that he and Robertson had been, in fact, essentially broken up for a while, but he denied having any relations with women other than Robertson. The two reconciled in the After the Final Rose episode.
The Instagram photo shows Robertson wearing her engagement ring.
Their story will soon take a backseat, as the eighth season of The Bachelorette premieres on May 14. The show will follow 26-year-old single mom Emily Maynard as she ventures to find love among 25 suitors.
Skeptics, beware: The Bachelorette has had success stories, the biggest one of which is first season bachelorette Trista Rehn, who is still married to firefighter husband Ryan Sutter. The couple has two children.
In terms of Bachelor success, former bachelor Jason Mesnick is married to his season's runner-up.