The swimsuit model made it to the final three women in Pavelka's season before she was sent home in St. Lucia. Pavelka went on to propose to Vienna Girardi in the finale, although the couple later split.
According to RumorFix.com, the airline pilot and Allemand have since begun dating, although neither has commented on the speculation.
However, Girardi, who is now dating former Bachelorette contestant Kasey Kahl from Ali Fedotowsky's season, posted a link to the dating story on her official Twitter account, saying: "Wishing them happiness."
She added about her own relationship: "So lucky that I have found such an amazing man. I am truly the luckiest girl in the world. @KaseyRKahl is everything I have every wanted. (sic)"
Pavelka, who was reported to be dating a wedding planner at the end of last year, is currently filming a new reality show alongside Heidi Montag and Danielle Staub, while Allemand appeared in the debut season of Bachelor Pad last summer.
The new season of The Bachelorette premieres Monday, May 23 on ABC.