Rousey, 26, hosted a Royal Rumble viewing party on Sunday night, to cheer on Punk in the 30-man battle.
In the Instagram video Rousey posted during the Royal Rumble, she is overheard saying that she thinks CM Punk is "sexy."
Since Rousey made those comments about Punk, MMA and pro wrestling message boards have been buzzing about a possible romance between the two.
However, there doesn't appear to be any truth to those rumors.
Rousey's Royal Rumble Instagram video included appearances from UFC superstars Shayna Baszler and Jessamyn Duke, plus Invicta FC standout Kaitlin Young.
Seconds into the video, Baszler yells "Yes!" as CM Punk walks out to the Royal Rumble ring.
Punk was the first contestant to enter the ring during the rumble, and "Team Rousey" was clearly delighted by the sight of him.
Rousey, who was sitting next to Baszler, is overheard saying "he's so sexy," as the video winds to a close. Rousey was clearly referring to CM Punk with the "sexy" comment, being that she said it just moments after the wrestler appeared on screen.
What fight fans can take away from this instance is that Rousey has a bit of a fangirl crush on CM Punk. Earlier this month, Rousey called Punk "sexy" on her official Twitter page, so her Royal Rumble comments weren't the first she made regarding the WWE standout.
"@CMPunk dammit! the second I said you were sexy you lost... Maybe I should cut that out... #SpeedosAndHoodiesAllDay #OldSchoolRaw," Rousey tweeted.
CM Punk is currently dating A.J. Lee, so UFC fans shouldn't get any funny ideas about Rousey pursuing the WWE star in any kind of serious manner.