Kim Zolciak's marriage is being rocked by rumors that her husband cheated on her with a cheerleader.

Elizabeth Seward is a former Indiana Pacers cheerleader. She told In Touch about the affair she allegedly carried on with Zolciak's husband, NFL star Kroy Biermann, saying they met in Indianapolis in January 2010 and immediately began a sexual relationship. She described it as a whirlwind and love at first sight.

Seward moved to Las Vegas that summer but said Biermann would still fly her down to Indianapolis.

"[He] told me everything you'd want to hear," Seward said. " 'You're my girlfriend. We're going to make this work.' "

Seward said that after she returned home from a July 2010 hook up with Biermann, she saw pictures of him attending the wedding of Cynthia Bailey with Zoliack. He and the Housewives of Atlanta star started dating in May 2010.

When Seward confronted him, Biermann tried to deny being involved with Zolciak and said she was only a friend.The two talked via text message about the betrayal and Seward offered the magazine screenshots as proof.

"I don't know what you want me to say. I f---ed up. I'm sorry," Kroy wrote.

Seward replied to him that he was disgusting; that she was angry he would say he loved her. She was also worried about her health since Biermann was sexually involved with two women at the same time.

Biermann finally admitted the truth but told her to keep quiet about it.

"I want Kim to know about it," Steward said. "The manipulation and the lies."

Zolciak and Biermann married on Nov. 11, 2011. The reality star tweeted her happiness on the occasion that day: "Beautiful weather! Beautiful day!! I'm walking on a cloud and I'm so grateful."

Biermann responded online with his own sweet affections: "Thank u everyone 4 your early congrats and best wishes!!! @Kimzolciak has made me the happiest man alive!!! 11.11.11."

The two are parents to Kroy Jagger Jr., who was born in 2011, and Kash Kade Biermann, born in 2012. They created a blended family with her Zolciak's children from a previous relationship, Brielle and Ariana.

A source close to Zolciak doesn't think Seward's revelation would ruin their family.

"It wasn't betrayal. It was just the normal thing that happens when someone is dating and finally falls for someone," the source said.

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Kim zolciak, Kroy biermann