Olivia Munn might know her quarterback boyfriend inside and out, but she may soon find out the competition for Aaron Rodgers' No. 1 fan is very stiff.

The actress has been dating the Packers signal caller since May 2014 and the couple is likely to take their relationship to the next level by getting engaged soon. Despite it being the NFL offseason, the Super Bowl XLV champion has kept himself plenty busy.

Rodgers is set to appear on the new half-hour, studio-based ABC show "Big Fan," which will be hosted by Andy Richter, according to ESPN. The rules of the show are simple.

Each week, a different celebrity will be featured and three of their biggest fans (who must be 18 or older and a legal U.S. resident) will compete to determine who the No. 1 super fan is.

The three contestants will go head-to-head-to-head to see who knows more about Rodgers, who will be playing for Midwest Athletes Against Childhood Cancer, which funds research for childhood cancer and blood disorders. Rodgers has raised more than $2.5 million for the charity per ESPN.

Other celebrities on the show will include actor Matthew McConaughey, reality television star Kim Kardashian West, actress Kristen Bell and musician Kid Rock.

Rodgers' biggest fan in his personal life is undoubtedly Munn, who always was his No. 1 cheerleader on social media throughout the NFL season. The Packers ended up making the playoffs, but ultimately fell to the Cardinals in January to end what was an up-and-down campaign for the quarterback, who was without No. 1 receiver Jordy Nelson due to an ACL tear.

The "X-Men: Apocalypse" star isn't engaged to Rodgers, but she has already thought ahead about pregnancy.

"I did years ago, I froze a bunch of eggs," Munn explained on the 'Anna Faris Is Unqualified' podcast per ABC News. "I went to the doctor and did the whole test and he said, 'You know, you actually have a lot of eggs. You're really lucky."

That doesn't mean she doesn't have some questions about the process.

"What happens to your vagina because I have heard horror stories," she said. "Really tell me, truly, truly tell me."

We're betting that won't be one of the questions when Rodgers appears on "Big Fan."

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