Singer Dolly Parton has apologized to a lesbian couple who accused Dollywood of discrimination.

Olivier Odom and Jennifer Tipton claim they were asked to turn a “Marriage is so gay” t-shirt inside out before being allowed to enter Dollywood's Splash Country in Pigeon Forge, Tennessee.

In a statement released to ABC News, Parton said she was “truly sorry” and embarrassed” for the incident.

“Everyone knows of my personal support of the gay and lesbian community,” Parton said.

The couple said they agreed to the park's dress code to avoid disappointing the children in their care.

“I was in disbelief,” Odom told Knoxville NBC affiliate WBIR.

“I looked at him and I was like really? He said, 'This is a family park,'” she added.

The “Marriage is so gay” t-shirt raises funds and awareness to support marriage equality.

Odom and Tipton married last year in South Carolina's Outerbanks. (Neither Tennessee nor South Carolina recognize such marriages.)

A scheduled August 2 meeting between Odom, Tipton and Dollywood officials was canceled because the couple wanted to include a representative from the Campaign for Southern Equality. The civil rights group had suggested Odom write a letter asking the park to articulate its policy on LGBT visitors.