updated 12/05/2013 AT 1:00 PM ET
•originally published 12/06/2013 AT 8:00 AM ET
Jen Arnold, star of the hit TLC series The Little Couple, is battling a rare form of cancer.
But what should have been a time of joy and celebration for the reality stars has been bittersweet, as Arnold reveals in an exclusive statement to PEOPLE.
“I have recently been diagnosed with a rare type of cancer and am currently undergoing treatment, including surgery and chemotherapy. Arnold says.
“I am very fortunate as the prognosis is good. While there is never a good time to get news like this, getting it just as we are building our new family is tough in many ways … But being surrounded by the love of my husband and our two beautiful children is actually in many ways giving me the strength to fight it even stronger.”
No further details about the type of cancer Arnold is facing are being released at this time.
Arnold and Klein have been reality stars since a TV special about their wedding, The Little Couple: Just Married, became a sensation for the network.
Since then, millions of viewers have watched Arnold and Klein, an entrepreneur who runs Rocky and Maggie’s Pet Shop in Houston, build their dream home, struggle with fertility and surrogacy issues, and ultimately, expand their family with the adoption of Will and Zoey.