Nick, 38, apparently slid into The O.C. alum's direct messages on Instagram -- strictly "professionally," or so he claims -- and asked her to appear on an episode of his TheViall Files podcast in July.
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"Cute dress," Nick commented on a photo of Rachel with her former Hart of Dixie co-stars Scott Porter and Wilson Bethel on August 4, according to Us.
Rachel reportedly complimented Nick's "sweet cuffs" on one of his pictures that same month, and she also cracked a joke about a plunger in the comments section of Nick's Charmin ad with Becca Tilley on September 9.
Nick also noticeably wrote "nice mountains" on a photo of Rachel sitting on a rock in the desert as recently as Saturday, September 14, Us reported.
Reports surfaced in September 2017 Rachel and her now ex-fiance, Hayden Christensen, called it quits on their relationship after dating for nearly a decade and welcoming Briar together.
Following two failed attempts at finding love on The Bachelorette and one season of Bachelor in Paradise, Nick starred on The Bachelor's 21st season.
He ended up getting engaged to Vanessa Grimaldi, but the pair split about five months after the finale aired in March 2017.
Gossip surrounding Nick's relationship with Rachel isn't the first time rumors have sparked about Nick potentially dating a celebrity.