"Vacation yin yang at its finest with my Mma soul Sista Carla Esparza," Herrig wrote of the encounter.
"#vacationYinYang good times!!!!" Esparza added.
The ladies were the absolute life of the party, and truly seemed to be enjoying each other's company. Esparza and Herrig weren't just playing up for the cameras.
Esparza, of course, has reason to celebrate, as she recently won the inaugural Invicta FC strawweight title with a convincing decision victory over Bec Hyatt.
Esparza used her solid wrestling skills to grind out a hard-fought win against a game Hyatt.
Esparza is unlikely to be fighting at Invicta FC 5, as the promotion already announced the card will feature two title fights.
Invicta FC 5 official fight announcements include Vanessa Porto (15-5) vs Barb Honchak (7-2) for the inaugural Invicta FC flyweight title, and an atomweight title bout between Jessica Penne (10-1) and Michelle Waterson (10-3).
Invicta FC President Shannon Knapp said Invicta FC fans can also expect to see the return of Invicta vets Bec Hyatt (4-2), Rose Namajunas (1-0) and Veronica Rothenhausler (1-0), as well as the promotional debut of ex-Strikeforce champ Sarah Kaufman (15-2).
Knapp said Invicta FC 5 was targeted for April 13, but she'll look at other dates since the UFC will host the TUF 17 Finale on the same night.
Knapp did not rule out another partnership with Ustream despite a breakdown in the company's paywall system at Invicta FC 4, which resulted in Invicta losing thousands of dollars.
"Yeah, absolutely, would I use them again? Yeah," Knapp said of Ustream. "If we do not have a [television] deal in place at that time, I'm sure we'll go back in and give it another whirl. I mean, why not? Why wouldn't we? It's a natural progression in the business, and we ask for very minimal, fan-friendly price points."
MMA fans can tweet the matchups they would like to see to @invictafights. While it's no guarantee the top suggested matchups will be added to the card, the promotion will undoubtedly take fan picks into consideration when deciding matches to put together for Invicta FC 5.
Invicta FC 5 will be held at the Bren Events Center in Irvine, Calif., with a targeted date of mid-April.
As for Herrig, she's coming off a win over Patricia Vidonic at Bellator 84. No word yet on when she plans to return to the cage. Herrig was recently spotted partying at the Invicta FC 4 afterparty, and her recent appearance with Esparza sealed her reputation as one of the top party girls in female MMA.