Jen Arnold
, best known as one of the stars of TLC’s “The Little Couple,” has been diagnosed with a rare form of cancer.

Peoplereports that Arnold has agreed to document her journey with her husband, Bill Klein, for their cable reality series.

“TLC has chronicled Bill and Jen’s lives since 2009 and at their request, we will be following them through this challenge,” a spokesperson for the network tells “People.” “Jen is a doctor and teacher and she saw this as an opportunity to educate and possibly help, through sharing her story.”

The 39-year-old reality star, who works as a medical director at Texas Children’s Hospital’s Pediatric Simulation Center, also teaches pediatrics at Baylor College of Medicine.

Arnold is “currently undergoing treatment, including surgery and chemotherapy.” She is the latest high-profile TV star to divulge the details of her cancer battle on-air, including E!’s Giuliana Rancic and, more recently, ABC News’ Amy Robach.

Both Arnold and her husband have forms of dwarfism, as do their two children. The most recent season of “The Little Couple” ended in October, as they prepared to adopt their daughter, Zoey.

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